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Savage Benchmark (100 runs) Double Precision
--------------------------------------------
The first four are from [TS Kelso's System Benchmarking column](http://celestrak.com/columns/v02n04/)
The Core i7 is Shashwat Kandadai's personal laptop
```
Value: Avg Time:
386DX-33 2500.00000000117734 6.81 s 33 MHz : MS-DOS 6.20
486DX2-66 " 1.26 s 66 MHz : Windows 95
Pentium 90 " 0.55 s 90 MHz : Windows 95
Pentium 133 " 0.38 s 133 MHz : Windows 95
Core i7 2500.0000000025643 0.58 ms 2.0 GHz : Mac OS X
```
Full day propagation results (1440 propagations)
-------------------------------------------------
```
Honeywell-6000 (from Space-Track Report #3)
init ms prpgtion ms
SGP4 1.9 2.5
SDP4 5.1 3.6
Core i7 (Shashwat Kandadai's personal computer)
init ms prpgtion ms
SGP4 0.074 0.0017
SDP4 0.092 0.0046
```

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# Changelog
## 5.0.0 (2023-01-06)
- Errors in calculations are fixed, WGS72 is used instead of WGS84 (#107).
- Dependencies are upgraded.
## 4.1.4 (2022-07-18)
- TypeScript definition for `ecfToEci` function is added.
## 4.1.3 (2020-12-18)
- Fixed calculation of Doppler effect (`dopplerFactor`).
## 4.1.2 (2020-10-13)
- Expose `error` in TypeScript definition of `SatRec`.
- Fix TypeScript definition for `PositionAndVelocity` to allow error handling.
## 4.1.1 (2020-09-15)
- Fix TypeScript definition for `gstime` (#73).
- Fix documentation and TypeScript definition for `degreesLong` and `degreesLat` (#74).
## 4.1.0 (2020-09-14)
- TypeScript support is added via new TypeScript definitions file (#71).
- Rollup and some other dependencies are upgraded.
## 4.0.0 (2020-01-21)
- Node.js 12 support is added. Node.js 6 and Node.js 8 support is dropped (breaking change).
- Mocha, Chai and Istanbul are replaced by [Jest](https://jestjs.io/).
- Dependencies are upgraded.
## 3.0.1 (2019-03-14)
- Unnecessary calculations in `sgp4` function are reduced (#47).
- `vkmpersec` calculation is moved to constants (#50).
- `degreesToRadians` function is used in docs instead of `deg2rad` constant (#53).
- Typos' fixes (#54).
## 3.0.0 (2018-11-26)
- Node.js 4 support is dropped (breaking change).
- Deprecated functions `gstimeFromJday` and `gstimeFromDate` are removed (breaking change).
- New transformation functions are added: `radiansToDegrees`, `degreesToRadians`, `radiansLat`, `radiansLong`.
## 2.0.3 (2018-09-15)
- `satrec` object is not cloned in `sgp4` and `sgp4init` functions due to [performance reasons](https://github.com/shashwatak/satellite-js/issues/45).
## 2.0.2 (2018-04-16)
- [Wrong predictions for Molniya 3-47 orbits](https://github.com/shashwatak/satellite-js/issues/43) are fixed. Special thanks to [@nhamer](https://github.com/nhamer).
## 2.0.1 (2018-03-01)
- `sgp4` function's call result is used in `sgp4init`.
- Longitude of `eciToGeodetic` result is in [-PI; PI] range now.
## 2.0.0 (2017-12-23)
- Library became ES and Common.js compatible.
- Source code is reorganized to match [original Python library](https://pypi.python.org/pypi/sgp4/).
- `degreesLat` and `degreesLong` don't adjust input radians value and throw `RangeError` if it's out of bounds (breaking change).
- `invjday` function is added.
- [Julian day calculations take account of milliseconds](https://github.com/shashwatak/satellite-js/issues/31)
([#38](https://github.com/shashwatak/satellite-js/pull/38)).
- [Incorrect position and velocity bug](https://github.com/shashwatak/satellite-js/issues/26) for times not close to TLE epoch is fixed ([#37](https://github.com/shashwatak/satellite-js/pull/37)).
- Continuous integration and test coverage are provided.
- [Bower support is dropped](https://github.com/shashwatak/satellite-js/issues/40).

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MIT License
Copyright (C) 2013 Shashwat Kandadai, UCSC Jack Baskin School of Engineering
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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Metadata-Version: 1.0
Name: sgp4
Version: 1.1
Summary: Track earth satellite TLE orbits using up-to-date 2010 version of SGP4
Home-page: https://github.com/brandon-rhodes/python-sgp4
Author: Brandon Rhodes
Author-email: brandon@rhodesmill.org
License: MIT
Description:
This Python package computes the position and velocity of an
earth-orbiting satellite, given the satellite's TLE orbital elements
from a source like `Celestrak <http://celestrak.com/>`_. It implements
the most recent version of SGP4, and is regularly run against the SGP4
test suite to make sure that its satellite position predictions **agree
to within 1 µm** of the predictions of the standard C++ implementation
of the algorithm. This error is far less than the 1–3 km/day by which
satellites themselves deviate from the ideal orbits described in TLE
files.
The C++ function names have been retained, since users may already be
familiar with this library in other languages. Here is how to compute
the x,y,z position and velocity for Vanguard 1 at 12:50:19 on 29
June 2000:
>>> from sgp4.earth_gravity import wgs72
>>> from sgp4.io import twoline2rv
>>> line1 = ('1 00005U 58002B 00179.78495062 '
... '.00000023 00000-0 28098-4 0 4753')
>>> line2 = ('2 00005 34.2682 348.7242 1859667 '
... '331.7664 19.3264 10.82419157413667')
>>>
>>> satellite = twoline2rv(line1, line2, wgs72)
>>> position, velocity = satellite.propagate(
... 2000, 6, 29, 12, 50, 19)
>>>
>>> position
[5576.056952400586, -3999.371134576452, -1521.9571594376037]
>>> velocity
[4.772627303379319, 5.119817120959591, 4.275553909172126]
The position vector measures the satellite position in **meters** from
the center of the earth. The velocity is the rate at which those same
three parameters are changing, expressed in **meters per second**.
There are three gravity models available that you can import from the
``earth_gravity`` module:
* ``wgs72``
* ``wgs72old``
* ``wgs84``
The ``wgs72`` model seems to be the most commonly used in the satellite
tracking community, and is probably the model behind most TLE elements
that are available for download.
The ``twoline2rv()`` function returns a ``Satellite`` object whose
attributes carry the data loaded from the TLE entry.
Most of this class's hundred-plus attributes are intermediate values
of interest only to the propagation algorithm itself. Here are the
attributes set by ``sgp4.io.twoline2rv()`` in which users are likely
to be interested:
``satnum``
Unique satellite number given in the TLE file.
``epochyr``
Full four-digit year of this element set's epoch moment.
``epochdays``
Fractional days into the year of the epoch moment.
``jdsatepoch``
Julian date of the epoch (computed from ``epochyr`` and ``epochdays``).
``ndot``
First time derivative of the mean motion (ignored by SGP4).
``nddot``
Second time derivative of the mean motion (ignored by SGP4).
``bstar``
Ballistic drag coefficient B* in inverse earth radii.
``inclo``
Inclination in radians.
``nodeo``
Right ascension of ascending node in radians.
``ecco``
Eccentricity.
``argpo``
Argument of perigee in radians.
``mo``
Mean anomaly in radians.
``no``
Mean motion in radians per minute.
This implementation passes all of the automated tests in the August 2010
release of the reference implementation of SGP4 by Vallado et al., who
originally published their revision of SGP4 in 2006:
Vallado, David A., Paul Crawford, Richard Hujsak, and T.S. Kelso, “Revisiting Spacetrack Report #3,” presented at the AIAA/AAS Astrodynamics Specialist Conference, Keystone, CO, 2006 August 21–24.
If you would like to review the paper, it is `available online
<http://www.celestrak.com/publications/AIAA/2006-6753/>`_. You can
always download the latest version of their code for comparison against
this Python module (or other implementations) at `AIAA-2006-6753.zip
<http://www.celestrak.com/publications/AIAA/2006-6753/AIAA-2006-6753.zip>`_.
This module was adapted from Vallado's C++ code since its revision date
was the most recently updated SGP4 implementation in their zip file:
* C++, August 2010
* Fortran, August 2008
* Pascal, August 2008
* Matlab, May 2008
* Java, July 2005
Changelog
---------
| 2012-11-22 — 1.1 — Python 3 compatibility; more documentation
| 2012-08-27 — 1.0 — Initial release
Platform: UNKNOWN
Classifier: Development Status :: 5 - Production/Stable
Classifier: Intended Audience :: Science/Research
Classifier: License :: OSI Approved :: MIT License
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 2.6
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.1
Classifier: Programming Language :: Python :: 3.2
Classifier: Topic :: Scientific/Engineering :: Astronomy

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# satellite.js
[![NPM version](https://img.shields.io/npm/v/satellite.js.svg)](https://www.npmjs.com/package/satellite.js)
[![Downloads/month](https://img.shields.io/npm/dm/satellite.js.svg)](https://www.npmjs.com/package/satellite.js)
[![Build Status](https://img.shields.io/travis/shashwatak/satellite-js/develop.svg)](https://travis-ci.org/shashwatak/satellite-js)
[![Coverage Status](https://img.shields.io/coveralls/github/shashwatak/satellite-js/develop.svg)](https://coveralls.io/github/shashwatak/satellite-js?branch=develop)
[![Gitter chat](https://img.shields.io/gitter/room/nwjs/nw.js.svg)](https://gitter.im/satellite-js/Lobby)
[![License](https://img.shields.io/github/license/mashape/apistatus.svg)](LICENSE.md)
## Introduction
A library to make satellite propagation via TLEs possible in the web.
Provides the functions necessary for SGP4/SDP4 calculations, as callable javascript. Also provides
functions for coordinate transforms.
The internals of this library are nearly identical to
[Brandon Rhode's sgp4 python library](https://pypi.python.org/pypi/sgp4/). However, it is encapsulated in a
standard JS library (self executing function), and exposes only the functionality needed to track satellites and
propagate paths. The only changes I made to Brandon Rhode's code was to change the positional parameters of
functions to key:value objects. This reduces the complexity of functions that require 50+ parameters,
and doesn't require the parameters to be placed in the exact order.
Special thanks to all contributors for improving usability and bug fixes :)
- [ezze (Dmitriy Pushkov)](https://github.com/ezze)
- [davidcalhoun (David Calhoun)](https://github.com/davidcalhoun)
- [tikhonovits (Nikos Sagias)](https://github.com/tikhonovits)
- [dangodev (Drew Powers)](https://github.com/dangodev)
- [thkruz (Theodore Kruczek)](https://github.com/thkruz)
- [bakercp (Christopher Baker)](https://github.com/bakercp)
- [kylegmaxwell (Kyle G. Maxwell)](https://github.com/kylegmaxwell)
- [iamthechad (Chad Johnston)](https://github.com/iamthechad)
- [drom (Aliaksei Chapyzhenka)](https://github.com/drom)
- [PeterDaveHello (Peter Dave Hello)](https://github.com/PeterDaveHello)
- [Alesha72003](https://github.com/Alesha72003)
- [nhamer](https://github.com/nhamer)
- [owntheweb](https://github.com/owntheweb)
- [Zigone](https://github.com/Zigone)
If you want to contribute to the project please read the [Contributing](#contributing) section first.
Sites using the library can be found [here](https://github.com/shashwatak/satellite-js/wiki/Sites-using-satellite.js).
**Start Here:**
- [TS Kelso's Columns for Satellite Times](http://celestrak.com/columns/), Orbital Propagation Parts I and II a must!
- [Wikipedia: Simplified Perturbations Model](http://en.wikipedia.org/wiki/Simplified_perturbations_models)
- [SpaceTrack Report #3, by Hoots and Roehrich](http://celestrak.com/NORAD/documentation/spacetrk.pdf).
The javascript in this library is heavily based (straight copied) from:
- The python [sgp4 1.1 by Brandon Rhodes](https://pypi.python.org/pypi/sgp4/)
- The C++ code by [David Vallado, et al](http://www.celestrak.com/publications/AIAA/2006-6753/)
I've included the original PKG-INFO file from the python library.
The coordinate transforms are based off T.S. Kelso's columns:
- [Part I](http://celestrak.com/columns/v02n01/)
- [Part II](http://celestrak.com/columns/v02n02/)
- [Part III](http://celestrak.com/columns/v02n03/)
And the coursework for UC Boulder's ASEN students
- [Coodinate Transforms @ UC Boulder](http://ccar.colorado.edu/ASEN5070/handouts/coordsys.doc)
I would recommend anybody interested in satellite tracking or orbital propagation to read
[all of TS Kelso's columns](http://celestrak.com/columns/). Without his work, this project would not be possible.
Get a free [Space Track account](https://www.space-track.org/auth/login) and download your own up to date TLEs
for use with this library.
## Installation
Install the library with [NPM](https://www.npmjs.com/):
```bash
npm install satellite.js
```
Install the library with [Yarn](https://yarnpkg.com/):
```bash
yarn add satellite.js
```
Install the library with [Bower](http://bower.io/):
```bash
bower install satellite.js
```
**Warning!**
`satellite.js` version 1.3.0 is the latest one for Bower since it has been deprecated.
## Usage
### Common.js ([Node.js](https://nodejs.org))
```js
var satellite = require('satellite.js');
...
var positionAndVelocity = satellite.sgp4(satrec, time);
```
### ES ([Babel.js](https://babeljs.io/))
```js
import { sgp4 } from 'satellite.js';
...
const positionAndVelocity = sgp4(satrec, time);
```
### AMD ([Require.js](http://requirejs.org/))
```js
define(['path/to/dist/satellite'], function(satellite) {
...
var positionAndVelocity = satellite.sgp4(satrec, time);
});
```
[Here is a repo](https://github.com/solarpatrol/satellite-requirejs) showing basic library usage with Require.js.
### Script tag
Include `dist/satellite.min.js` as a script in your html:
```html
<script src="path/to/dist/satellite.min.js"></script>
```
`satellite` object will be available in global scope:
```js
var positionAndVelocity = satellite.sgp4(satrec, time);
```
## Sample Usage
```js
// Sample TLE
var tleLine1 = '1 25544U 98067A 19156.50900463 .00003075 00000-0 59442-4 0 9992',
tleLine2 = '2 25544 51.6433 59.2583 0008217 16.4489 347.6017 15.51174618173442';
// Initialize a satellite record
var satrec = satellite.twoline2satrec(tleLine1, tleLine2);
// Propagate satellite using time since epoch (in minutes).
var positionAndVelocity = satellite.sgp4(satrec, timeSinceTleEpochMinutes);
// Or you can use a JavaScript Date
var positionAndVelocity = satellite.propagate(satrec, new Date());
// The position_velocity result is a key-value pair of ECI coordinates.
// These are the base results from which all other coordinates are derived.
var positionEci = positionAndVelocity.position,
velocityEci = positionAndVelocity.velocity;
// Set the Observer at 122.03 West by 36.96 North, in RADIANS
var observerGd = {
longitude: satellite.degreesToRadians(-122.0308),
latitude: satellite.degreesToRadians(36.9613422),
height: 0.370
};
// You will need GMST for some of the coordinate transforms.
// http://en.wikipedia.org/wiki/Sidereal_time#Definition
var gmst = satellite.gstime(new Date());
// You can get ECF, Geodetic, Look Angles, and Doppler Factor.
var positionEcf = satellite.eciToEcf(positionEci, gmst),
observerEcf = satellite.geodeticToEcf(observerGd),
positionGd = satellite.eciToGeodetic(positionEci, gmst),
lookAngles = satellite.ecfToLookAngles(observerGd, positionEcf),
dopplerFactor = satellite.dopplerFactor(observerCoordsEcf, positionEcf, velocityEcf);
// The coordinates are all stored in key-value pairs.
// ECI and ECF are accessed by `x`, `y`, `z` properties.
var satelliteX = positionEci.x,
satelliteY = positionEci.y,
satelliteZ = positionEci.z;
// Look Angles may be accessed by `azimuth`, `elevation`, `range_sat` properties.
var azimuth = lookAngles.azimuth,
elevation = lookAngles.elevation,
rangeSat = lookAngles.rangeSat;
// Geodetic coords are accessed via `longitude`, `latitude`, `height`.
var longitude = positionGd.longitude,
latitude = positionGd.latitude,
height = positionGd.height;
// Convert the RADIANS to DEGREES.
var longitudeDeg = satellite.degreesLong(longitude),
latitudeDeg = satellite.degreesLat(latitude);
```
## Contributing
This repo follows [Gitflow Workflow](https://www.atlassian.com/git/tutorials/comparing-workflows/gitflow-workflow).
Before starting a work on new [pull request](https://github.com/shashwatak/satellite-js/compare), please, checkout your
feature or bugfix branch from `develop` branch:
```bash
git checkout develop
git fetch origin
git merge origin/develop
git checkout -b my-feature
```
Make sure that your changes don't break the existing code by running
```bash
npm test
```
and that your code follows [Airbnb](https://www.npmjs.com/package/eslint-config-airbnb-base) style
```bash
npm run lint
npm run lint:test
```
Implementing new functions or features, please, if possible, provide tests to cover them and mention your works in
[Changelog](CHANGELOG.md). Please don't change version number in `package.json` and don't add it to `CHANGELOG.md`.
All these things should be done later with [raise-version](https://github.com/ezze/node-raise-version) when
merging to `master`:
```bash
npm run raise major
```
or
```bash
npm run raise minor
```
or
```bash
npm run raise patch
```
In order to get test code coverage run the following:
```bash
npm run test:coverage
```
## Building
The source code is organized as Common.js modules and uses [ES6 syntax](http://es6-features.org/).
In order to build the library follow these steps:
- install [Node.js](https://nodejs.org/) and [Node Package Manager](https://www.npmjs.com/);
- install all required packages with NPM by running the following command from repository's root directory:
```bash
npm install
```
- run the following NPM script to build everything:
```bash
npm run build
```
- run the following NPM script to run test specs `test/*.spec.js` files with [Mocha](https://mochajs.org/):
```bash
npm test
```
These is a full list of all available NPM scripts:
- `build` builds everything;
- `transpile` transpiles ES source files located in `src` directory to Common.js compatible modules and saves
the resulting files in `lib` directory;
- `dist` builds ES and UMD modules in `dist` directory;
- `dist:es` builds ES module in `dist` directory;
- `dist:umd` builds [UMD](https://github.com/umdjs/umd) module in `dist` directory (both non-compressed and
compressed versions);
- `dist:umd:dev` builds non-compressed version of UMD module in `dist` directory;
- `dist:umd:prod` builds compressed version of UMD module in `dist` directory;
- `watch:es` watches for changes in `src` directory and automatically rebuilds ES module;
- `copy` copies built library from `dist` to [SGP4 verification](#benchmarking) application's directory;
- `lint` lints sources code located in `src` directory with [ESLint](http://eslint.org/) with
[Airbnb shared configuration]((https://www.npmjs.com/package/eslint-config-airbnb));
- `lint:test` lints tests located in `test` directory with ESLint;
- `test` runs tests;
- `test:coverage` runs tests with [Istanbul](https://github.com/gotwarlost/istanbul) coverage summary;
- `test:coveralls` runs tests with Istanbul coverage summary and aggregates the results by
[Coveralls](https://coveralls.io/github/shashwatak/satellite-js); in order to run it locally
`COVERALLS_REPO_TOKEN` is required:
```
COVERALLS_REPO_TOKEN=<token> npm run test:coveralls
```
## ES5 and satellite.min.js
Some people are confused that they can't just download a single satellite.js or satellite.min.js file. That is because satellite.js is not written in plain old JavaScript (ES5) anymore but ported to latter JavaScript versions ES6+.
Only the "src" directory is included in the Git repository, "dist" and "lib" directories are ignored. It's done intentionally to retain the size of the repository as small as possible. A full detailed explanation of why is located [here](https://github.com/shashwatak/satellite-js/issues/80#issuecomment-749225324).
You should install satellite.js with your package manager (npm or yarn) and then find satellite.js and satellite.min.js in node_modules/satellite.js/dist directory.
## TODO
Optional functions that utilize Worker Threads
## Exposed Objects
### satrec
The `satrec` object comes from the original code by Rhodes as well as Vallado. It is immense and complex, but the
most important values it contains are the Keplerian Elements and the other values pulled from the TLEs. I do not
suggest that anybody try to simplify it unless they have absolute understanding of Orbital Mechanics.
- `satnum` Unique satellite number given in the TLE file.
- `epochyr` Full four-digit year of this element set's epoch moment.
- `epochdays` Fractional days into the year of the epoch moment.
- `jdsatepoch` Julian date of the epoch (computed from `epochyr` and `epochdays`).
- `ndot` First time derivative of the mean motion (ignored by SGP4).
- `nddot` Second time derivative of the mean motion (ignored by SGP4).
- `bstar` Ballistic drag coefficient B* in inverse earth radii.
- `inclo` Inclination in radians.
- `nodeo` Right ascension of ascending node in radians.
- `ecco` Eccentricity.
- `argpo` Argument of perigee in radians.
- `mo` Mean anomaly in radians.
- `no` Mean motion in radians per minute.
## Exposed Functions
### Initialization
```js
var satrec = satellite.twoline2satrec(longstr1, longstr2);
```
returns satrec object, created from the TLEs passed in. The satrec object is vastly complicated, but you don't have
to do anything with it, except pass it around.
NOTE! You are responsible for providing TLEs. [Get your free Space Track account here.](https://www.space-track.org/auth/login)
longstr1 and longstr2 are the two lines of the TLE, properly formatted by NASA and NORAD standards. if you use
Space Track, there should be no problem.
### Propagation
Both `propagate()` and `sgp4()` functions return position and velocity as a dictionary of the form:
```json
{
"position": { "x" : 1, "y" : 1, "z" : 1 },
"velocity": { "x" : 1, "y" : 1, "z" : 1 }
}
```
position is in km, velocity is in km/s, both the ECI coordinate frame.
```js
var positionAndVelocity = satellite.propagate(satrec, new Date());
```
Returns position and velocity, given a satrec and the calendar date. Is merely a wrapper for `sgp4()`, converts the
calendar day to Julian time since satellite epoch. Sometimes it's better to ask for position and velocity given
a specific date.
```js
var positionAndVelocity = satellite.sgp4(satrec, timeSinceTleEpochMinutes);
```
Returns position and velocity, given a satrec and the time in minutes since epoch. Sometimes it's better to ask for
position and velocity given the time elapsed since epoch.
### Doppler
You can get the satellites current Doppler factor, relative to your position, using the `dopplerFactor()` function.
Use either ECI or ECF coordinates, but don't mix them.
```js
var dopplerFactor = satellite.dopplerFactor(observer, position, velocity);
```
See the section on Coordinate Transforms to see how to get ECF/ECI/Geodetic coordinates.
### Coordinate Transforms
#### Greenwich Mean Sidereal Time
You'll need to provide some of the coordinate transform functions with your current GMST aka GSTIME. You can use
Julian Day:
```js
var gmst = satellite.gstime(julianDay);
```
or a JavaScript Date:
```js
var gmst = satellite.gstime(new Date());
```
#### Transforms
Most of these are self explanatory from their names. Coords are arrays of three floats EX: [1.1, 1.2, 1.3] in
kilometers. Once again, read the following first.
The coordinate transforms are based off T.S. Kelso's columns:
* [Part I](http://celestrak.com/columns/v02n01/)
* [Part II](http://celestrak.com/columns/v02n02/)
* [Part III](http://celestrak.com/columns/v02n03/)
And the coursework for UC Boulder's ASEN students
* [Coodinate Transforms @ UC Boulder](http://ccar.colorado.edu/ASEN5070/handouts/coordsys.doc)
These four are used to convert between ECI, ECF, and Geodetic, as you need them. ECI and ECF coordinates are in
km or km/s. Geodetic coords are in radians.
```js
var ecfCoords = satellite.eciToEcf(eciCoords, gmst);
```
```js
var eciCoords = satellite.ecfToEci(ecfCoords, gmst);
```
```js
var geodeticCoords = satellite.eciToGeodetic(eciCoords, gmst);
```
```js
var ecfCoords = satellite.geodeticToEcf(geodeticCoords);
```
These function is used to compute the look angle, from your geodetic position to a satellite in ECF coordinates.
Make sure you convert the ECI output from sgp4() and propagate() to ECF first.
```js
var lookAngles = satellite.ecfToLookAngles(observerGeodetic, satelliteEcf);
```
#### Latitude and Longitude
These two functions will return human readable Latitude or Longitude strings (Ex: "125.35W" or "45.565N")
from `geodeticCoords`:
```js
var latitudeStr = satellite.degreesLat(geodeticRadians),
longitudeStr = satellite.degreesLong(geodeticRadians);
```
## Note about Code Conventions
Like Brandon Rhodes before me, I chose to maintain as little difference between this implementation and the prior
works. This is to make adapting future changes suggested by Vallado much simpler. Thus, some of the conventions
used in this library are very weird.
## How this was written
I took advantage of the fact that Python and JavaScript are nearly semantically identical. Most of the code is
just copied straight from Python. Brandon Rhodes did me the favor of including semi-colons on most of the lines of
code. JavaScript doesn't support multiple values returned per statement, so I had to rewrite the function calls.
Absolutely none of the mathematical logic had to be rewritten.
## Benchmarking
I've included a small testing app, that provides some benchmarking tools and verifies SGP4 and SDP4 using the
Test Criteria provided by SpaceTrack Report #3, and is based off
[System Benchmarking](http://celestrak.com/columns/v02n04/) by TS Kelso.
The testing app is a Chrome Packaged App that uses the `angular.js` framework.
Before running the app build the library and copy resulting files from `dist` directory to app's directory with
the following command:
```bash
npm run copy
```
To run the test, open up Chrome, go to the extensions page, and check "Developer Mode". Then, click "Load Unpacked App",
and select the `sgp4_verification` folder. Then run the app from within Chrome. The test file is located within
the `sgp4_verification` directory, as a JSON file called `spacetrack-report-3.json`.
## Acknowledgments
Major thanks go to Brandon Rhodes, TS Kelso, and David Vallado's team. Also, I'd like to thank Professor Steve
Petersen (AC6P) of UCSC for pointing me in the correct directions.
## License
All files marked with the License header at the top are Licensed. Any files unmarked by me or others are
unlicensed, and are kept only as a resource for [Shashwat Kandadai and other developers] for testing.
I chose the [MIT License](LICENSE.md) because this library is a derivative work off
[Brandon Rhodes sgp4](https://pypi.python.org/pypi/sgp4/), and that is licensed with MIT. It just seemed simpler
this way, sub-licensing freedoms notwithstanding.
I worked in the Dining Hall at UCSC for a month, which means I signed a form that gives UCSC partial ownership of
anything I make while under their aegis, so I included them as owners of the copyright.
Please email all complaints to help@ucsc.edu

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/*!
* satellite-js v5.0.0
* (c) 2013 Shashwat Kandadai and UCSC
* https://github.com/shashwatak/satellite-js
* License: MIT
*/
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.xke = exports.x2o3 = exports.vkmpersec = exports.twoPi = exports.tumin = exports.rad2deg = exports.pi = exports.mu = exports.minutesPerDay = exports.j4 = exports.j3oj2 = exports.j3 = exports.j2 = exports.earthRadius = exports.deg2rad = void 0;
var pi = Math.PI;
exports.pi = pi;
var twoPi = pi * 2;
exports.twoPi = twoPi;
var deg2rad = pi / 180.0;
exports.deg2rad = deg2rad;
var rad2deg = 180 / pi;
exports.rad2deg = rad2deg;
var minutesPerDay = 1440.0;
exports.minutesPerDay = minutesPerDay;
var mu = 398600.8; // in km3 / s2
exports.mu = mu;
var earthRadius = 6378.135; // in km
exports.earthRadius = earthRadius;
var xke = 60.0 / Math.sqrt(earthRadius * earthRadius * earthRadius / mu);
exports.xke = xke;
var vkmpersec = earthRadius * xke / 60.0;
exports.vkmpersec = vkmpersec;
var tumin = 1.0 / xke;
exports.tumin = tumin;
var j2 = 0.001082616;
exports.j2 = j2;
var j3 = -0.00000253881;
exports.j3 = j3;
var j4 = -0.00000165597;
exports.j4 = j4;
var j3oj2 = j3 / j2;
exports.j3oj2 = j3oj2;
var x2o3 = 2.0 / 3.0;
exports.x2o3 = x2o3;

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/*!
* satellite-js v5.0.0
* (c) 2013 Shashwat Kandadai and UCSC
* https://github.com/shashwatak/satellite-js
* License: MIT
*/
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports["default"] = dopplerFactor;
function dopplerFactor(location, position, velocity) {
var mfactor = 7.292115E-5;
var c = 299792.458; // Speed of light in km/s
var range = {
x: position.x - location.x,
y: position.y - location.y,
z: position.z - location.z
};
range.w = Math.sqrt(Math.pow(range.x, 2) + Math.pow(range.y, 2) + Math.pow(range.z, 2));
var rangeVel = {
x: velocity.x + mfactor * location.y,
y: velocity.y - mfactor * location.x,
z: velocity.z
};
function sign(value) {
return value >= 0 ? 1 : -1;
}
var rangeRate = (range.x * rangeVel.x + range.y * rangeVel.y + range.z * rangeVel.z) / range.w;
return 1 + rangeRate / c * sign(rangeRate);
}

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/*!
* satellite-js v5.0.0
* (c) 2013 Shashwat Kandadai and UCSC
* https://github.com/shashwatak/satellite-js
* License: MIT
*/
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.days2mdhms = days2mdhms;
exports.invjday = invjday;
exports.jday = jday;
/* -----------------------------------------------------------------------------
*
* procedure days2mdhms
*
* this procedure converts the day of the year, days, to the equivalent month
* day, hour, minute and second.
*
* algorithm : set up array for the number of days per month
* find leap year - use 1900 because 2000 is a leap year
* loop through a temp value while the value is < the days
* perform int conversions to the correct day and month
* convert remainder into h m s using type conversions
*
* author : david vallado 719-573-2600 1 mar 2001
*
* inputs description range / units
* year - year 1900 .. 2100
* days - julian day of the year 0.0 .. 366.0
*
* outputs :
* mon - month 1 .. 12
* day - day 1 .. 28,29,30,31
* hr - hour 0 .. 23
* min - minute 0 .. 59
* sec - second 0.0 .. 59.999
*
* locals :
* dayofyr - day of year
* temp - temporary extended values
* inttemp - temporary int value
* i - index
* lmonth[12] - int array containing the number of days per month
*
* coupling :
* none.
* --------------------------------------------------------------------------- */
function days2mdhms(year, days) {
var lmonth = [31, year % 4 === 0 ? 29 : 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
var dayofyr = Math.floor(days);
// ----------------- find month and day of month ----------------
var i = 1;
var inttemp = 0;
while (dayofyr > inttemp + lmonth[i - 1] && i < 12) {
inttemp += lmonth[i - 1];
i += 1;
}
var mon = i;
var day = dayofyr - inttemp;
// ----------------- find hours minutes and seconds -------------
var temp = (days - dayofyr) * 24.0;
var hr = Math.floor(temp);
temp = (temp - hr) * 60.0;
var minute = Math.floor(temp);
var sec = (temp - minute) * 60.0;
return {
mon: mon,
day: day,
hr: hr,
minute: minute,
sec: sec
};
}
/* -----------------------------------------------------------------------------
*
* procedure jday
*
* this procedure finds the julian date given the year, month, day, and time.
* the julian date is defined by each elapsed day since noon, jan 1, 4713 bc.
*
* algorithm : calculate the answer in one step for efficiency
*
* author : david vallado 719-573-2600 1 mar 2001
*
* inputs description range / units
* year - year 1900 .. 2100
* mon - month 1 .. 12
* day - day 1 .. 28,29,30,31
* hr - universal time hour 0 .. 23
* min - universal time min 0 .. 59
* sec - universal time sec 0.0 .. 59.999
*
* outputs :
* jd - julian date days from 4713 bc
*
* locals :
* none.
*
* coupling :
* none.
*
* references :
* vallado 2007, 189, alg 14, ex 3-14
*
* --------------------------------------------------------------------------- */
function jdayInternal(year, mon, day, hr, minute, sec) {
var msec = arguments.length > 6 && arguments[6] !== undefined ? arguments[6] : 0;
return 367.0 * year - Math.floor(7 * (year + Math.floor((mon + 9) / 12.0)) * 0.25) + Math.floor(275 * mon / 9.0) + day + 1721013.5 + ((msec / 60000 + sec / 60.0 + minute) / 60.0 + hr) / 24.0 // ut in days
// # - 0.5*sgn(100.0*year + mon - 190002.5) + 0.5;
;
}
function jday(year, mon, day, hr, minute, sec, msec) {
if (year instanceof Date) {
var date = year;
return jdayInternal(date.getUTCFullYear(), date.getUTCMonth() + 1,
// Note, this function requires months in range 1-12.
date.getUTCDate(), date.getUTCHours(), date.getUTCMinutes(), date.getUTCSeconds(), date.getUTCMilliseconds());
}
return jdayInternal(year, mon, day, hr, minute, sec, msec);
}
/* -----------------------------------------------------------------------------
*
* procedure invjday
*
* this procedure finds the year, month, day, hour, minute and second
* given the julian date. tu can be ut1, tdt, tdb, etc.
*
* algorithm : set up starting values
* find leap year - use 1900 because 2000 is a leap year
* find the elapsed days through the year in a loop
* call routine to find each individual value
*
* author : david vallado 719-573-2600 1 mar 2001
*
* inputs description range / units
* jd - julian date days from 4713 bc
*
* outputs :
* year - year 1900 .. 2100
* mon - month 1 .. 12
* day - day 1 .. 28,29,30,31
* hr - hour 0 .. 23
* min - minute 0 .. 59
* sec - second 0.0 .. 59.999
*
* locals :
* days - day of year plus fractional
* portion of a day days
* tu - julian centuries from 0 h
* jan 0, 1900
* temp - temporary double values
* leapyrs - number of leap years from 1900
*
* coupling :
* days2mdhms - finds month, day, hour, minute and second given days and year
*
* references :
* vallado 2007, 208, alg 22, ex 3-13
* --------------------------------------------------------------------------- */
function invjday(jd, asArray) {
// --------------- find year and days of the year -
var temp = jd - 2415019.5;
var tu = temp / 365.25;
var year = 1900 + Math.floor(tu);
var leapyrs = Math.floor((year - 1901) * 0.25);
// optional nudge by 8.64x10-7 sec to get even outputs
var days = temp - ((year - 1900) * 365.0 + leapyrs) + 0.00000000001;
// ------------ check for case of beginning of a year -----------
if (days < 1.0) {
year -= 1;
leapyrs = Math.floor((year - 1901) * 0.25);
days = temp - ((year - 1900) * 365.0 + leapyrs);
}
// ----------------- find remaing data -------------------------
var mdhms = days2mdhms(year, days);
var mon = mdhms.mon,
day = mdhms.day,
hr = mdhms.hr,
minute = mdhms.minute;
var sec = mdhms.sec - 0.00000086400;
if (asArray) {
return [year, mon, day, hr, minute, Math.floor(sec)];
}
return new Date(Date.UTC(year, mon - 1, day, hr, minute, Math.floor(sec)));
}

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/*!
* satellite-js v5.0.0
* (c) 2013 Shashwat Kandadai and UCSC
* https://github.com/shashwatak/satellite-js
* License: MIT
*/
"use strict";
function _typeof(obj) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (obj) { return typeof obj; } : function (obj) { return obj && "function" == typeof Symbol && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }, _typeof(obj); }
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.constants = void 0;
Object.defineProperty(exports, "degreesLat", {
enumerable: true,
get: function get() {
return _transforms.degreesLat;
}
});
Object.defineProperty(exports, "degreesLong", {
enumerable: true,
get: function get() {
return _transforms.degreesLong;
}
});
Object.defineProperty(exports, "degreesToRadians", {
enumerable: true,
get: function get() {
return _transforms.degreesToRadians;
}
});
Object.defineProperty(exports, "dopplerFactor", {
enumerable: true,
get: function get() {
return _dopplerFactor["default"];
}
});
Object.defineProperty(exports, "ecfToEci", {
enumerable: true,
get: function get() {
return _transforms.ecfToEci;
}
});
Object.defineProperty(exports, "ecfToLookAngles", {
enumerable: true,
get: function get() {
return _transforms.ecfToLookAngles;
}
});
Object.defineProperty(exports, "eciToEcf", {
enumerable: true,
get: function get() {
return _transforms.eciToEcf;
}
});
Object.defineProperty(exports, "eciToGeodetic", {
enumerable: true,
get: function get() {
return _transforms.eciToGeodetic;
}
});
Object.defineProperty(exports, "geodeticToEcf", {
enumerable: true,
get: function get() {
return _transforms.geodeticToEcf;
}
});
Object.defineProperty(exports, "gstime", {
enumerable: true,
get: function get() {
return _propagation.gstime;
}
});
Object.defineProperty(exports, "invjday", {
enumerable: true,
get: function get() {
return _ext.invjday;
}
});
Object.defineProperty(exports, "jday", {
enumerable: true,
get: function get() {
return _ext.jday;
}
});
Object.defineProperty(exports, "propagate", {
enumerable: true,
get: function get() {
return _propagation.propagate;
}
});
Object.defineProperty(exports, "radiansLat", {
enumerable: true,
get: function get() {
return _transforms.radiansLat;
}
});
Object.defineProperty(exports, "radiansLong", {
enumerable: true,
get: function get() {
return _transforms.radiansLong;
}
});
Object.defineProperty(exports, "radiansToDegrees", {
enumerable: true,
get: function get() {
return _transforms.radiansToDegrees;
}
});
Object.defineProperty(exports, "sgp4", {
enumerable: true,
get: function get() {
return _propagation.sgp4;
}
});
Object.defineProperty(exports, "twoline2satrec", {
enumerable: true,
get: function get() {
return _io["default"];
}
});
var constants = _interopRequireWildcard(require("./constants"));
exports.constants = constants;
var _ext = require("./ext");
var _io = _interopRequireDefault(require("./io"));
var _propagation = require("./propagation");
var _dopplerFactor = _interopRequireDefault(require("./dopplerFactor"));
var _transforms = require("./transforms");
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { "default": obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }

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/*!
* satellite-js v5.0.0
* (c) 2013 Shashwat Kandadai and UCSC
* https://github.com/shashwatak/satellite-js
* License: MIT
*/
"use strict";
function _typeof(obj) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (obj) { return typeof obj; } : function (obj) { return obj && "function" == typeof Symbol && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }, _typeof(obj); }
Object.defineProperty(exports, "__esModule", {
value: true
});
exports["default"] = void 0;
var constants = _interopRequireWildcard(require("./constants"));
var _ext = require("./ext");
var _io = _interopRequireDefault(require("./io"));
var _propagation = require("./propagation");
var _dopplerFactor = _interopRequireDefault(require("./dopplerFactor"));
var _transforms = require("./transforms");
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { "default": obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
var _default = {
constants: constants,
// Propagation
propagate: _propagation.propagate,
sgp4: _propagation.sgp4,
twoline2satrec: _io["default"],
gstime: _propagation.gstime,
jday: _ext.jday,
invjday: _ext.invjday,
dopplerFactor: _dopplerFactor["default"],
// Coordinate transforms
radiansToDegrees: _transforms.radiansToDegrees,
degreesToRadians: _transforms.degreesToRadians,
degreesLat: _transforms.degreesLat,
degreesLong: _transforms.degreesLong,
radiansLat: _transforms.radiansLat,
radiansLong: _transforms.radiansLong,
geodeticToEcf: _transforms.geodeticToEcf,
eciToGeodetic: _transforms.eciToGeodetic,
eciToEcf: _transforms.eciToEcf,
ecfToEci: _transforms.ecfToEci,
ecfToLookAngles: _transforms.ecfToLookAngles
};
exports["default"] = _default;

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/*!
* satellite-js v5.0.0
* (c) 2013 Shashwat Kandadai and UCSC
* https://github.com/shashwatak/satellite-js
* License: MIT
*/
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports["default"] = twoline2satrec;
var _constants = require("./constants");
var _ext = require("./ext");
var _sgp4init = _interopRequireDefault(require("./propagation/sgp4init"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
/* -----------------------------------------------------------------------------
*
* function twoline2rv
*
* this function converts the two line element set character string data to
* variables and initializes the sgp4 variables. several intermediate varaibles
* and quantities are determined. note that the result is a structure so multiple
* satellites can be processed simultaneously without having to reinitialize. the
* verification mode is an important option that permits quick checks of any
* changes to the underlying technical theory. this option works using a
* modified tle file in which the start, stop, and delta time values are
* included at the end of the second line of data. this only works with the
* verification mode. the catalog mode simply propagates from -1440 to 1440 min
* from epoch and is useful when performing entire catalog runs.
*
* author : david vallado 719-573-2600 1 mar 2001
*
* inputs :
* longstr1 - first line of the tle
* longstr2 - second line of the tle
* typerun - type of run verification 'v', catalog 'c',
* manual 'm'
* typeinput - type of manual input mfe 'm', epoch 'e', dayofyr 'd'
* opsmode - mode of operation afspc or improved 'a', 'i'
* whichconst - which set of constants to use 72, 84
*
* outputs :
* satrec - structure containing all the sgp4 satellite information
*
* coupling :
* getgravconst-
* days2mdhms - conversion of days to month, day, hour, minute, second
* jday - convert day month year hour minute second into julian date
* sgp4init - initialize the sgp4 variables
*
* references :
* norad spacetrack report #3
* vallado, crawford, hujsak, kelso 2006
--------------------------------------------------------------------------- */
/**
* Return a Satellite imported from two lines of TLE data.
*
* Provide the two TLE lines as strings `longstr1` and `longstr2`,
* and select which standard set of gravitational constants you want
* by providing `gravity_constants`:
*
* `sgp4.propagation.wgs72` - Standard WGS 72 model
* `sgp4.propagation.wgs84` - More recent WGS 84 model
* `sgp4.propagation.wgs72old` - Legacy support for old SGP4 behavior
*
* Normally, computations are made using letious recent improvements
* to the algorithm. If you want to turn some of these off and go
* back into "afspc" mode, then set `afspc_mode` to `True`.
*/
function twoline2satrec(longstr1, longstr2) {
var opsmode = 'i';
var xpdotp = 1440.0 / (2.0 * _constants.pi); // 229.1831180523293;
var year = 0;
var satrec = {};
satrec.error = 0;
satrec.satnum = longstr1.substring(2, 7);
satrec.epochyr = parseInt(longstr1.substring(18, 20), 10);
satrec.epochdays = parseFloat(longstr1.substring(20, 32));
satrec.ndot = parseFloat(longstr1.substring(33, 43));
satrec.nddot = parseFloat(".".concat(parseInt(longstr1.substring(44, 50), 10), "E").concat(longstr1.substring(50, 52)));
satrec.bstar = parseFloat("".concat(longstr1.substring(53, 54), ".").concat(parseInt(longstr1.substring(54, 59), 10), "E").concat(longstr1.substring(59, 61)));
// satrec.satnum = longstr2.substring(2, 7);
satrec.inclo = parseFloat(longstr2.substring(8, 16));
satrec.nodeo = parseFloat(longstr2.substring(17, 25));
satrec.ecco = parseFloat(".".concat(longstr2.substring(26, 33)));
satrec.argpo = parseFloat(longstr2.substring(34, 42));
satrec.mo = parseFloat(longstr2.substring(43, 51));
satrec.no = parseFloat(longstr2.substring(52, 63));
// ---- find no, ndot, nddot ----
satrec.no /= xpdotp; // rad/min
// satrec.nddot= satrec.nddot * Math.pow(10.0, nexp);
// satrec.bstar= satrec.bstar * Math.pow(10.0, ibexp);
// ---- convert to sgp4 units ----
// satrec.ndot /= (xpdotp * 1440.0); // ? * minperday
// satrec.nddot /= (xpdotp * 1440.0 * 1440);
// ---- find standard orbital elements ----
satrec.inclo *= _constants.deg2rad;
satrec.nodeo *= _constants.deg2rad;
satrec.argpo *= _constants.deg2rad;
satrec.mo *= _constants.deg2rad;
// ----------------------------------------------------------------
// find sgp4epoch time of element set
// remember that sgp4 uses units of days from 0 jan 1950 (sgp4epoch)
// and minutes from the epoch (time)
// ----------------------------------------------------------------
// ---------------- temp fix for years from 1957-2056 -------------------
// --------- correct fix will occur when year is 4-digit in tle ---------
if (satrec.epochyr < 57) {
year = satrec.epochyr + 2000;
} else {
year = satrec.epochyr + 1900;
}
var mdhmsResult = (0, _ext.days2mdhms)(year, satrec.epochdays);
var mon = mdhmsResult.mon,
day = mdhmsResult.day,
hr = mdhmsResult.hr,
minute = mdhmsResult.minute,
sec = mdhmsResult.sec;
satrec.jdsatepoch = (0, _ext.jday)(year, mon, day, hr, minute, sec);
// ---------------- initialize the orbit at sgp4epoch -------------------
(0, _sgp4init["default"])(satrec, {
opsmode: opsmode,
satn: satrec.satnum,
epoch: satrec.jdsatepoch - 2433281.5,
xbstar: satrec.bstar,
xecco: satrec.ecco,
xargpo: satrec.argpo,
xinclo: satrec.inclo,
xmo: satrec.mo,
xno: satrec.no,
xnodeo: satrec.nodeo
});
return satrec;
}

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@@ -1,34 +0,0 @@
/*!
* satellite-js v5.0.0
* (c) 2013 Shashwat Kandadai and UCSC
* https://github.com/shashwatak/satellite-js
* License: MIT
*/
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
Object.defineProperty(exports, "gstime", {
enumerable: true,
get: function get() {
return _gstime["default"];
}
});
Object.defineProperty(exports, "propagate", {
enumerable: true,
get: function get() {
return _propagate["default"];
}
});
Object.defineProperty(exports, "sgp4", {
enumerable: true,
get: function get() {
return _sgp["default"];
}
});
var _propagate = _interopRequireDefault(require("./propagation/propagate"));
var _sgp = _interopRequireDefault(require("./propagation/sgp4"));
var _gstime = _interopRequireDefault(require("./propagation/gstime"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }

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@@ -1,259 +0,0 @@
/*!
* satellite-js v5.0.0
* (c) 2013 Shashwat Kandadai and UCSC
* https://github.com/shashwatak/satellite-js
* License: MIT
*/
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports["default"] = dpper;
var _constants = require("../constants");
/* -----------------------------------------------------------------------------
*
* procedure dpper
*
* this procedure provides deep space long period periodic contributions
* to the mean elements. by design, these periodics are zero at epoch.
* this used to be dscom which included initialization, but it's really a
* recurring function.
*
* author : david vallado 719-573-2600 28 jun 2005
*
* inputs :
* e3 -
* ee2 -
* peo -
* pgho -
* pho -
* pinco -
* plo -
* se2 , se3 , sgh2, sgh3, sgh4, sh2, sh3, si2, si3, sl2, sl3, sl4 -
* t -
* xh2, xh3, xi2, xi3, xl2, xl3, xl4 -
* zmol -
* zmos -
* ep - eccentricity 0.0 - 1.0
* inclo - inclination - needed for lyddane modification
* nodep - right ascension of ascending node
* argpp - argument of perigee
* mp - mean anomaly
*
* outputs :
* ep - eccentricity 0.0 - 1.0
* inclp - inclination
* nodep - right ascension of ascending node
* argpp - argument of perigee
* mp - mean anomaly
*
* locals :
* alfdp -
* betdp -
* cosip , sinip , cosop , sinop ,
* dalf -
* dbet -
* dls -
* f2, f3 -
* pe -
* pgh -
* ph -
* pinc -
* pl -
* sel , ses , sghl , sghs , shl , shs , sil , sinzf , sis ,
* sll , sls
* xls -
* xnoh -
* zf -
* zm -
*
* coupling :
* none.
*
* references :
* hoots, roehrich, norad spacetrack report #3 1980
* hoots, norad spacetrack report #6 1986
* hoots, schumacher and glover 2004
* vallado, crawford, hujsak, kelso 2006
----------------------------------------------------------------------------*/
function dpper(satrec, options) {
var e3 = satrec.e3,
ee2 = satrec.ee2,
peo = satrec.peo,
pgho = satrec.pgho,
pho = satrec.pho,
pinco = satrec.pinco,
plo = satrec.plo,
se2 = satrec.se2,
se3 = satrec.se3,
sgh2 = satrec.sgh2,
sgh3 = satrec.sgh3,
sgh4 = satrec.sgh4,
sh2 = satrec.sh2,
sh3 = satrec.sh3,
si2 = satrec.si2,
si3 = satrec.si3,
sl2 = satrec.sl2,
sl3 = satrec.sl3,
sl4 = satrec.sl4,
t = satrec.t,
xgh2 = satrec.xgh2,
xgh3 = satrec.xgh3,
xgh4 = satrec.xgh4,
xh2 = satrec.xh2,
xh3 = satrec.xh3,
xi2 = satrec.xi2,
xi3 = satrec.xi3,
xl2 = satrec.xl2,
xl3 = satrec.xl3,
xl4 = satrec.xl4,
zmol = satrec.zmol,
zmos = satrec.zmos;
var init = options.init,
opsmode = options.opsmode;
var ep = options.ep,
inclp = options.inclp,
nodep = options.nodep,
argpp = options.argpp,
mp = options.mp;
// Copy satellite attributes into local variables for convenience
// and symmetry in writing formulae.
var alfdp;
var betdp;
var cosip;
var sinip;
var cosop;
var sinop;
var dalf;
var dbet;
var dls;
var f2;
var f3;
var pe;
var pgh;
var ph;
var pinc;
var pl;
var sinzf;
var xls;
var xnoh;
var zf;
var zm;
// ---------------------- constants -----------------------------
var zns = 1.19459e-5;
var zes = 0.01675;
var znl = 1.5835218e-4;
var zel = 0.05490;
// --------------- calculate time varying periodics -----------
zm = zmos + zns * t;
// be sure that the initial call has time set to zero
if (init === 'y') {
zm = zmos;
}
zf = zm + 2.0 * zes * Math.sin(zm);
sinzf = Math.sin(zf);
f2 = 0.5 * sinzf * sinzf - 0.25;
f3 = -0.5 * sinzf * Math.cos(zf);
var ses = se2 * f2 + se3 * f3;
var sis = si2 * f2 + si3 * f3;
var sls = sl2 * f2 + sl3 * f3 + sl4 * sinzf;
var sghs = sgh2 * f2 + sgh3 * f3 + sgh4 * sinzf;
var shs = sh2 * f2 + sh3 * f3;
zm = zmol + znl * t;
if (init === 'y') {
zm = zmol;
}
zf = zm + 2.0 * zel * Math.sin(zm);
sinzf = Math.sin(zf);
f2 = 0.5 * sinzf * sinzf - 0.25;
f3 = -0.5 * sinzf * Math.cos(zf);
var sel = ee2 * f2 + e3 * f3;
var sil = xi2 * f2 + xi3 * f3;
var sll = xl2 * f2 + xl3 * f3 + xl4 * sinzf;
var sghl = xgh2 * f2 + xgh3 * f3 + xgh4 * sinzf;
var shll = xh2 * f2 + xh3 * f3;
pe = ses + sel;
pinc = sis + sil;
pl = sls + sll;
pgh = sghs + sghl;
ph = shs + shll;
if (init === 'n') {
pe -= peo;
pinc -= pinco;
pl -= plo;
pgh -= pgho;
ph -= pho;
inclp += pinc;
ep += pe;
sinip = Math.sin(inclp);
cosip = Math.cos(inclp);
/* ----------------- apply periodics directly ------------ */
// sgp4fix for lyddane choice
// strn3 used original inclination - this is technically feasible
// gsfc used perturbed inclination - also technically feasible
// probably best to readjust the 0.2 limit value and limit discontinuity
// 0.2 rad = 11.45916 deg
// use next line for original strn3 approach and original inclination
// if (inclo >= 0.2)
// use next line for gsfc version and perturbed inclination
if (inclp >= 0.2) {
ph /= sinip;
pgh -= cosip * ph;
argpp += pgh;
nodep += ph;
mp += pl;
} else {
// ---- apply periodics with lyddane modification ----
sinop = Math.sin(nodep);
cosop = Math.cos(nodep);
alfdp = sinip * sinop;
betdp = sinip * cosop;
dalf = ph * cosop + pinc * cosip * sinop;
dbet = -ph * sinop + pinc * cosip * cosop;
alfdp += dalf;
betdp += dbet;
nodep %= _constants.twoPi;
// sgp4fix for afspc written intrinsic functions
// nodep used without a trigonometric function ahead
if (nodep < 0.0 && opsmode === 'a') {
nodep += _constants.twoPi;
}
xls = mp + argpp + cosip * nodep;
dls = pl + pgh - pinc * nodep * sinip;
xls += dls;
xnoh = nodep;
nodep = Math.atan2(alfdp, betdp);
// sgp4fix for afspc written intrinsic functions
// nodep used without a trigonometric function ahead
if (nodep < 0.0 && opsmode === 'a') {
nodep += _constants.twoPi;
}
if (Math.abs(xnoh - nodep) > _constants.pi) {
if (nodep < xnoh) {
nodep += _constants.twoPi;
} else {
nodep -= _constants.twoPi;
}
}
mp += pl;
argpp = xls - mp - cosip * nodep;
}
}
return {
ep: ep,
inclp: inclp,
nodep: nodep,
argpp: argpp,
mp: mp
};
}

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@@ -1,395 +0,0 @@
/*!
* satellite-js v5.0.0
* (c) 2013 Shashwat Kandadai and UCSC
* https://github.com/shashwatak/satellite-js
* License: MIT
*/
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports["default"] = dscom;
var _constants = require("../constants");
/*-----------------------------------------------------------------------------
*
* procedure dscom
*
* this procedure provides deep space common items used by both the secular
* and periodics subroutines. input is provided as shown. this routine
* used to be called dpper, but the functions inside weren't well organized.
*
* author : david vallado 719-573-2600 28 jun 2005
*
* inputs :
* epoch -
* ep - eccentricity
* argpp - argument of perigee
* tc -
* inclp - inclination
* nodep - right ascension of ascending node
* np - mean motion
*
* outputs :
* sinim , cosim , sinomm , cosomm , snodm , cnodm
* day -
* e3 -
* ee2 -
* em - eccentricity
* emsq - eccentricity squared
* gam -
* peo -
* pgho -
* pho -
* pinco -
* plo -
* rtemsq -
* se2, se3 -
* sgh2, sgh3, sgh4 -
* sh2, sh3, si2, si3, sl2, sl3, sl4 -
* s1, s2, s3, s4, s5, s6, s7 -
* ss1, ss2, ss3, ss4, ss5, ss6, ss7, sz1, sz2, sz3 -
* sz11, sz12, sz13, sz21, sz22, sz23, sz31, sz32, sz33 -
* xgh2, xgh3, xgh4, xh2, xh3, xi2, xi3, xl2, xl3, xl4 -
* nm - mean motion
* z1, z2, z3, z11, z12, z13, z21, z22, z23, z31, z32, z33 -
* zmol -
* zmos -
*
* locals :
* a1, a2, a3, a4, a5, a6, a7, a8, a9, a10 -
* betasq -
* cc -
* ctem, stem -
* x1, x2, x3, x4, x5, x6, x7, x8 -
* xnodce -
* xnoi -
* zcosg , zsing , zcosgl , zsingl , zcosh , zsinh , zcoshl , zsinhl ,
* zcosi , zsini , zcosil , zsinil ,
* zx -
* zy -
*
* coupling :
* none.
*
* references :
* hoots, roehrich, norad spacetrack report #3 1980
* hoots, norad spacetrack report #6 1986
* hoots, schumacher and glover 2004
* vallado, crawford, hujsak, kelso 2006
----------------------------------------------------------------------------*/
function dscom(options) {
var epoch = options.epoch,
ep = options.ep,
argpp = options.argpp,
tc = options.tc,
inclp = options.inclp,
nodep = options.nodep,
np = options.np;
var a1;
var a2;
var a3;
var a4;
var a5;
var a6;
var a7;
var a8;
var a9;
var a10;
var cc;
var x1;
var x2;
var x3;
var x4;
var x5;
var x6;
var x7;
var x8;
var zcosg;
var zsing;
var zcosh;
var zsinh;
var zcosi;
var zsini;
var ss1;
var ss2;
var ss3;
var ss4;
var ss5;
var ss6;
var ss7;
var sz1;
var sz2;
var sz3;
var sz11;
var sz12;
var sz13;
var sz21;
var sz22;
var sz23;
var sz31;
var sz32;
var sz33;
var s1;
var s2;
var s3;
var s4;
var s5;
var s6;
var s7;
var z1;
var z2;
var z3;
var z11;
var z12;
var z13;
var z21;
var z22;
var z23;
var z31;
var z32;
var z33;
// -------------------------- constants -------------------------
var zes = 0.01675;
var zel = 0.05490;
var c1ss = 2.9864797e-6;
var c1l = 4.7968065e-7;
var zsinis = 0.39785416;
var zcosis = 0.91744867;
var zcosgs = 0.1945905;
var zsings = -0.98088458;
// --------------------- local variables ------------------------
var nm = np;
var em = ep;
var snodm = Math.sin(nodep);
var cnodm = Math.cos(nodep);
var sinomm = Math.sin(argpp);
var cosomm = Math.cos(argpp);
var sinim = Math.sin(inclp);
var cosim = Math.cos(inclp);
var emsq = em * em;
var betasq = 1.0 - emsq;
var rtemsq = Math.sqrt(betasq);
// ----------------- initialize lunar solar terms ---------------
var peo = 0.0;
var pinco = 0.0;
var plo = 0.0;
var pgho = 0.0;
var pho = 0.0;
var day = epoch + 18261.5 + tc / 1440.0;
var xnodce = (4.5236020 - 9.2422029e-4 * day) % _constants.twoPi;
var stem = Math.sin(xnodce);
var ctem = Math.cos(xnodce);
var zcosil = 0.91375164 - 0.03568096 * ctem;
var zsinil = Math.sqrt(1.0 - zcosil * zcosil);
var zsinhl = 0.089683511 * stem / zsinil;
var zcoshl = Math.sqrt(1.0 - zsinhl * zsinhl);
var gam = 5.8351514 + 0.0019443680 * day;
var zx = 0.39785416 * stem / zsinil;
var zy = zcoshl * ctem + 0.91744867 * zsinhl * stem;
zx = Math.atan2(zx, zy);
zx += gam - xnodce;
var zcosgl = Math.cos(zx);
var zsingl = Math.sin(zx);
// ------------------------- do solar terms ---------------------
zcosg = zcosgs;
zsing = zsings;
zcosi = zcosis;
zsini = zsinis;
zcosh = cnodm;
zsinh = snodm;
cc = c1ss;
var xnoi = 1.0 / nm;
var lsflg = 0;
while (lsflg < 2) {
lsflg += 1;
a1 = zcosg * zcosh + zsing * zcosi * zsinh;
a3 = -zsing * zcosh + zcosg * zcosi * zsinh;
a7 = -zcosg * zsinh + zsing * zcosi * zcosh;
a8 = zsing * zsini;
a9 = zsing * zsinh + zcosg * zcosi * zcosh;
a10 = zcosg * zsini;
a2 = cosim * a7 + sinim * a8;
a4 = cosim * a9 + sinim * a10;
a5 = -sinim * a7 + cosim * a8;
a6 = -sinim * a9 + cosim * a10;
x1 = a1 * cosomm + a2 * sinomm;
x2 = a3 * cosomm + a4 * sinomm;
x3 = -a1 * sinomm + a2 * cosomm;
x4 = -a3 * sinomm + a4 * cosomm;
x5 = a5 * sinomm;
x6 = a6 * sinomm;
x7 = a5 * cosomm;
x8 = a6 * cosomm;
z31 = 12.0 * x1 * x1 - 3.0 * x3 * x3;
z32 = 24.0 * x1 * x2 - 6.0 * x3 * x4;
z33 = 12.0 * x2 * x2 - 3.0 * x4 * x4;
z1 = 3.0 * (a1 * a1 + a2 * a2) + z31 * emsq;
z2 = 6.0 * (a1 * a3 + a2 * a4) + z32 * emsq;
z3 = 3.0 * (a3 * a3 + a4 * a4) + z33 * emsq;
z11 = -6.0 * a1 * a5 + emsq * (-24.0 * x1 * x7 - 6.0 * x3 * x5);
z12 = -6.0 * (a1 * a6 + a3 * a5) + emsq * (-24.0 * (x2 * x7 + x1 * x8) + -6.0 * (x3 * x6 + x4 * x5));
z13 = -6.0 * a3 * a6 + emsq * (-24.0 * x2 * x8 - 6.0 * x4 * x6);
z21 = 6.0 * a2 * a5 + emsq * (24.0 * x1 * x5 - 6.0 * x3 * x7);
z22 = 6.0 * (a4 * a5 + a2 * a6) + emsq * (24.0 * (x2 * x5 + x1 * x6) - 6.0 * (x4 * x7 + x3 * x8));
z23 = 6.0 * a4 * a6 + emsq * (24.0 * x2 * x6 - 6.0 * x4 * x8);
z1 = z1 + z1 + betasq * z31;
z2 = z2 + z2 + betasq * z32;
z3 = z3 + z3 + betasq * z33;
s3 = cc * xnoi;
s2 = -0.5 * s3 / rtemsq;
s4 = s3 * rtemsq;
s1 = -15.0 * em * s4;
s5 = x1 * x3 + x2 * x4;
s6 = x2 * x3 + x1 * x4;
s7 = x2 * x4 - x1 * x3;
// ----------------------- do lunar terms -------------------
if (lsflg === 1) {
ss1 = s1;
ss2 = s2;
ss3 = s3;
ss4 = s4;
ss5 = s5;
ss6 = s6;
ss7 = s7;
sz1 = z1;
sz2 = z2;
sz3 = z3;
sz11 = z11;
sz12 = z12;
sz13 = z13;
sz21 = z21;
sz22 = z22;
sz23 = z23;
sz31 = z31;
sz32 = z32;
sz33 = z33;
zcosg = zcosgl;
zsing = zsingl;
zcosi = zcosil;
zsini = zsinil;
zcosh = zcoshl * cnodm + zsinhl * snodm;
zsinh = snodm * zcoshl - cnodm * zsinhl;
cc = c1l;
}
}
var zmol = (4.7199672 + (0.22997150 * day - gam)) % _constants.twoPi;
var zmos = (6.2565837 + 0.017201977 * day) % _constants.twoPi;
// ------------------------ do solar terms ----------------------
var se2 = 2.0 * ss1 * ss6;
var se3 = 2.0 * ss1 * ss7;
var si2 = 2.0 * ss2 * sz12;
var si3 = 2.0 * ss2 * (sz13 - sz11);
var sl2 = -2.0 * ss3 * sz2;
var sl3 = -2.0 * ss3 * (sz3 - sz1);
var sl4 = -2.0 * ss3 * (-21.0 - 9.0 * emsq) * zes;
var sgh2 = 2.0 * ss4 * sz32;
var sgh3 = 2.0 * ss4 * (sz33 - sz31);
var sgh4 = -18.0 * ss4 * zes;
var sh2 = -2.0 * ss2 * sz22;
var sh3 = -2.0 * ss2 * (sz23 - sz21);
// ------------------------ do lunar terms ----------------------
var ee2 = 2.0 * s1 * s6;
var e3 = 2.0 * s1 * s7;
var xi2 = 2.0 * s2 * z12;
var xi3 = 2.0 * s2 * (z13 - z11);
var xl2 = -2.0 * s3 * z2;
var xl3 = -2.0 * s3 * (z3 - z1);
var xl4 = -2.0 * s3 * (-21.0 - 9.0 * emsq) * zel;
var xgh2 = 2.0 * s4 * z32;
var xgh3 = 2.0 * s4 * (z33 - z31);
var xgh4 = -18.0 * s4 * zel;
var xh2 = -2.0 * s2 * z22;
var xh3 = -2.0 * s2 * (z23 - z21);
return {
snodm: snodm,
cnodm: cnodm,
sinim: sinim,
cosim: cosim,
sinomm: sinomm,
cosomm: cosomm,
day: day,
e3: e3,
ee2: ee2,
em: em,
emsq: emsq,
gam: gam,
peo: peo,
pgho: pgho,
pho: pho,
pinco: pinco,
plo: plo,
rtemsq: rtemsq,
se2: se2,
se3: se3,
sgh2: sgh2,
sgh3: sgh3,
sgh4: sgh4,
sh2: sh2,
sh3: sh3,
si2: si2,
si3: si3,
sl2: sl2,
sl3: sl3,
sl4: sl4,
s1: s1,
s2: s2,
s3: s3,
s4: s4,
s5: s5,
s6: s6,
s7: s7,
ss1: ss1,
ss2: ss2,
ss3: ss3,
ss4: ss4,
ss5: ss5,
ss6: ss6,
ss7: ss7,
sz1: sz1,
sz2: sz2,
sz3: sz3,
sz11: sz11,
sz12: sz12,
sz13: sz13,
sz21: sz21,
sz22: sz22,
sz23: sz23,
sz31: sz31,
sz32: sz32,
sz33: sz33,
xgh2: xgh2,
xgh3: xgh3,
xgh4: xgh4,
xh2: xh2,
xh3: xh3,
xi2: xi2,
xi3: xi3,
xl2: xl2,
xl3: xl3,
xl4: xl4,
nm: nm,
z1: z1,
z2: z2,
z3: z3,
z11: z11,
z12: z12,
z13: z13,
z21: z21,
z22: z22,
z23: z23,
z31: z31,
z32: z32,
z33: z33,
zmol: zmol,
zmos: zmos
};
}

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@@ -1,407 +0,0 @@
/*!
* satellite-js v5.0.0
* (c) 2013 Shashwat Kandadai and UCSC
* https://github.com/shashwatak/satellite-js
* License: MIT
*/
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports["default"] = dsinit;
var _constants = require("../constants");
/*-----------------------------------------------------------------------------
*
* procedure dsinit
*
* this procedure provides deep space contributions to mean motion dot due
* to geopotential resonance with half day and one day orbits.
*
* author : david vallado 719-573-2600 28 jun 2005
*
* inputs :
* cosim, sinim-
* emsq - eccentricity squared
* argpo - argument of perigee
* s1, s2, s3, s4, s5 -
* ss1, ss2, ss3, ss4, ss5 -
* sz1, sz3, sz11, sz13, sz21, sz23, sz31, sz33 -
* t - time
* tc -
* gsto - greenwich sidereal time rad
* mo - mean anomaly
* mdot - mean anomaly dot (rate)
* no - mean motion
* nodeo - right ascension of ascending node
* nodedot - right ascension of ascending node dot (rate)
* xpidot -
* z1, z3, z11, z13, z21, z23, z31, z33 -
* eccm - eccentricity
* argpm - argument of perigee
* inclm - inclination
* mm - mean anomaly
* xn - mean motion
* nodem - right ascension of ascending node
*
* outputs :
* em - eccentricity
* argpm - argument of perigee
* inclm - inclination
* mm - mean anomaly
* nm - mean motion
* nodem - right ascension of ascending node
* irez - flag for resonance 0-none, 1-one day, 2-half day
* atime -
* d2201, d2211, d3210, d3222, d4410, d4422, d5220, d5232, d5421, d5433 -
* dedt -
* didt -
* dmdt -
* dndt -
* dnodt -
* domdt -
* del1, del2, del3 -
* ses , sghl , sghs , sgs , shl , shs , sis , sls
* theta -
* xfact -
* xlamo -
* xli -
* xni
*
* locals :
* ainv2 -
* aonv -
* cosisq -
* eoc -
* f220, f221, f311, f321, f322, f330, f441, f442, f522, f523, f542, f543 -
* g200, g201, g211, g300, g310, g322, g410, g422, g520, g521, g532, g533 -
* sini2 -
* temp -
* temp1 -
* theta -
* xno2 -
*
* coupling :
* getgravconst
*
* references :
* hoots, roehrich, norad spacetrack report #3 1980
* hoots, norad spacetrack report #6 1986
* hoots, schumacher and glover 2004
* vallado, crawford, hujsak, kelso 2006
----------------------------------------------------------------------------*/
function dsinit(options) {
var cosim = options.cosim,
argpo = options.argpo,
s1 = options.s1,
s2 = options.s2,
s3 = options.s3,
s4 = options.s4,
s5 = options.s5,
sinim = options.sinim,
ss1 = options.ss1,
ss2 = options.ss2,
ss3 = options.ss3,
ss4 = options.ss4,
ss5 = options.ss5,
sz1 = options.sz1,
sz3 = options.sz3,
sz11 = options.sz11,
sz13 = options.sz13,
sz21 = options.sz21,
sz23 = options.sz23,
sz31 = options.sz31,
sz33 = options.sz33,
t = options.t,
tc = options.tc,
gsto = options.gsto,
mo = options.mo,
mdot = options.mdot,
no = options.no,
nodeo = options.nodeo,
nodedot = options.nodedot,
xpidot = options.xpidot,
z1 = options.z1,
z3 = options.z3,
z11 = options.z11,
z13 = options.z13,
z21 = options.z21,
z23 = options.z23,
z31 = options.z31,
z33 = options.z33,
ecco = options.ecco,
eccsq = options.eccsq;
var emsq = options.emsq,
em = options.em,
argpm = options.argpm,
inclm = options.inclm,
mm = options.mm,
nm = options.nm,
nodem = options.nodem,
irez = options.irez,
atime = options.atime,
d2201 = options.d2201,
d2211 = options.d2211,
d3210 = options.d3210,
d3222 = options.d3222,
d4410 = options.d4410,
d4422 = options.d4422,
d5220 = options.d5220,
d5232 = options.d5232,
d5421 = options.d5421,
d5433 = options.d5433,
dedt = options.dedt,
didt = options.didt,
dmdt = options.dmdt,
dnodt = options.dnodt,
domdt = options.domdt,
del1 = options.del1,
del2 = options.del2,
del3 = options.del3,
xfact = options.xfact,
xlamo = options.xlamo,
xli = options.xli,
xni = options.xni;
var f220;
var f221;
var f311;
var f321;
var f322;
var f330;
var f441;
var f442;
var f522;
var f523;
var f542;
var f543;
var g200;
var g201;
var g211;
var g300;
var g310;
var g322;
var g410;
var g422;
var g520;
var g521;
var g532;
var g533;
var sini2;
var temp;
var temp1;
var xno2;
var ainv2;
var aonv;
var cosisq;
var eoc;
var q22 = 1.7891679e-6;
var q31 = 2.1460748e-6;
var q33 = 2.2123015e-7;
var root22 = 1.7891679e-6;
var root44 = 7.3636953e-9;
var root54 = 2.1765803e-9;
// eslint-disable-next-line no-loss-of-precision
var rptim = 4.37526908801129966e-3; // equates to 7.29211514668855e-5 rad/sec
var root32 = 3.7393792e-7;
var root52 = 1.1428639e-7;
var znl = 1.5835218e-4;
var zns = 1.19459e-5;
// -------------------- deep space initialization ------------
irez = 0;
if (nm < 0.0052359877 && nm > 0.0034906585) {
irez = 1;
}
if (nm >= 8.26e-3 && nm <= 9.24e-3 && em >= 0.5) {
irez = 2;
}
// ------------------------ do solar terms -------------------
var ses = ss1 * zns * ss5;
var sis = ss2 * zns * (sz11 + sz13);
var sls = -zns * ss3 * (sz1 + sz3 - 14.0 - 6.0 * emsq);
var sghs = ss4 * zns * (sz31 + sz33 - 6.0);
var shs = -zns * ss2 * (sz21 + sz23);
// sgp4fix for 180 deg incl
if (inclm < 5.2359877e-2 || inclm > _constants.pi - 5.2359877e-2) {
shs = 0.0;
}
if (sinim !== 0.0) {
shs /= sinim;
}
var sgs = sghs - cosim * shs;
// ------------------------- do lunar terms ------------------
dedt = ses + s1 * znl * s5;
didt = sis + s2 * znl * (z11 + z13);
dmdt = sls - znl * s3 * (z1 + z3 - 14.0 - 6.0 * emsq);
var sghl = s4 * znl * (z31 + z33 - 6.0);
var shll = -znl * s2 * (z21 + z23);
// sgp4fix for 180 deg incl
if (inclm < 5.2359877e-2 || inclm > _constants.pi - 5.2359877e-2) {
shll = 0.0;
}
domdt = sgs + sghl;
dnodt = shs;
if (sinim !== 0.0) {
domdt -= cosim / sinim * shll;
dnodt += shll / sinim;
}
// ----------- calculate deep space resonance effects --------
var dndt = 0.0;
var theta = (gsto + tc * rptim) % _constants.twoPi;
em += dedt * t;
inclm += didt * t;
argpm += domdt * t;
nodem += dnodt * t;
mm += dmdt * t;
// sgp4fix for negative inclinations
// the following if statement should be commented out
// if (inclm < 0.0)
// {
// inclm = -inclm;
// argpm = argpm - pi;
// nodem = nodem + pi;
// }
// -------------- initialize the resonance terms -------------
if (irez !== 0) {
aonv = Math.pow(nm / _constants.xke, _constants.x2o3);
// ---------- geopotential resonance for 12 hour orbits ------
if (irez === 2) {
cosisq = cosim * cosim;
var emo = em;
em = ecco;
var emsqo = emsq;
emsq = eccsq;
eoc = em * emsq;
g201 = -0.306 - (em - 0.64) * 0.440;
if (em <= 0.65) {
g211 = 3.616 - 13.2470 * em + 16.2900 * emsq;
g310 = -19.302 + 117.3900 * em - 228.4190 * emsq + 156.5910 * eoc;
g322 = -18.9068 + 109.7927 * em - 214.6334 * emsq + 146.5816 * eoc;
g410 = -41.122 + 242.6940 * em - 471.0940 * emsq + 313.9530 * eoc;
g422 = -146.407 + 841.8800 * em - 1629.014 * emsq + 1083.4350 * eoc;
g520 = -532.114 + 3017.977 * em - 5740.032 * emsq + 3708.2760 * eoc;
} else {
g211 = -72.099 + 331.819 * em - 508.738 * emsq + 266.724 * eoc;
g310 = -346.844 + 1582.851 * em - 2415.925 * emsq + 1246.113 * eoc;
g322 = -342.585 + 1554.908 * em - 2366.899 * emsq + 1215.972 * eoc;
g410 = -1052.797 + 4758.686 * em - 7193.992 * emsq + 3651.957 * eoc;
g422 = -3581.690 + 16178.110 * em - 24462.770 * emsq + 12422.520 * eoc;
if (em > 0.715) {
g520 = -5149.66 + 29936.92 * em - 54087.36 * emsq + 31324.56 * eoc;
} else {
g520 = 1464.74 - 4664.75 * em + 3763.64 * emsq;
}
}
if (em < 0.7) {
g533 = -919.22770 + 4988.6100 * em - 9064.7700 * emsq + 5542.21 * eoc;
g521 = -822.71072 + 4568.6173 * em - 8491.4146 * emsq + 5337.524 * eoc;
g532 = -853.66600 + 4690.2500 * em - 8624.7700 * emsq + 5341.4 * eoc;
} else {
g533 = -37995.780 + 161616.52 * em - 229838.20 * emsq + 109377.94 * eoc;
g521 = -51752.104 + 218913.95 * em - 309468.16 * emsq + 146349.42 * eoc;
g532 = -40023.880 + 170470.89 * em - 242699.48 * emsq + 115605.82 * eoc;
}
sini2 = sinim * sinim;
f220 = 0.75 * (1.0 + 2.0 * cosim + cosisq);
f221 = 1.5 * sini2;
f321 = 1.875 * sinim * (1.0 - 2.0 * cosim - 3.0 * cosisq);
f322 = -1.875 * sinim * (1.0 + 2.0 * cosim - 3.0 * cosisq);
f441 = 35.0 * sini2 * f220;
f442 = 39.3750 * sini2 * sini2;
f522 = 9.84375 * sinim * (sini2 * (1.0 - 2.0 * cosim - 5.0 * cosisq) + 0.33333333 * (-2.0 + 4.0 * cosim + 6.0 * cosisq));
f523 = sinim * (4.92187512 * sini2 * (-2.0 - 4.0 * cosim + 10.0 * cosisq) + 6.56250012 * (1.0 + 2.0 * cosim - 3.0 * cosisq));
f542 = 29.53125 * sinim * (2.0 - 8.0 * cosim + cosisq * (-12.0 + 8.0 * cosim + 10.0 * cosisq));
f543 = 29.53125 * sinim * (-2.0 - 8.0 * cosim + cosisq * (12.0 + 8.0 * cosim - 10.0 * cosisq));
xno2 = nm * nm;
ainv2 = aonv * aonv;
temp1 = 3.0 * xno2 * ainv2;
temp = temp1 * root22;
d2201 = temp * f220 * g201;
d2211 = temp * f221 * g211;
temp1 *= aonv;
temp = temp1 * root32;
d3210 = temp * f321 * g310;
d3222 = temp * f322 * g322;
temp1 *= aonv;
temp = 2.0 * temp1 * root44;
d4410 = temp * f441 * g410;
d4422 = temp * f442 * g422;
temp1 *= aonv;
temp = temp1 * root52;
d5220 = temp * f522 * g520;
d5232 = temp * f523 * g532;
temp = 2.0 * temp1 * root54;
d5421 = temp * f542 * g521;
d5433 = temp * f543 * g533;
xlamo = (mo + nodeo + nodeo - (theta + theta)) % _constants.twoPi;
xfact = mdot + dmdt + 2.0 * (nodedot + dnodt - rptim) - no;
em = emo;
emsq = emsqo;
}
// ---------------- synchronous resonance terms --------------
if (irez === 1) {
g200 = 1.0 + emsq * (-2.5 + 0.8125 * emsq);
g310 = 1.0 + 2.0 * emsq;
g300 = 1.0 + emsq * (-6.0 + 6.60937 * emsq);
f220 = 0.75 * (1.0 + cosim) * (1.0 + cosim);
f311 = 0.9375 * sinim * sinim * (1.0 + 3.0 * cosim) - 0.75 * (1.0 + cosim);
f330 = 1.0 + cosim;
f330 *= 1.875 * f330 * f330;
del1 = 3.0 * nm * nm * aonv * aonv;
del2 = 2.0 * del1 * f220 * g200 * q22;
del3 = 3.0 * del1 * f330 * g300 * q33 * aonv;
del1 = del1 * f311 * g310 * q31 * aonv;
xlamo = (mo + nodeo + argpo - theta) % _constants.twoPi;
xfact = mdot + xpidot + dmdt + domdt + dnodt - (no + rptim);
}
// ------------ for sgp4, initialize the integrator ----------
xli = xlamo;
xni = no;
atime = 0.0;
nm = no + dndt;
}
return {
em: em,
argpm: argpm,
inclm: inclm,
mm: mm,
nm: nm,
nodem: nodem,
irez: irez,
atime: atime,
d2201: d2201,
d2211: d2211,
d3210: d3210,
d3222: d3222,
d4410: d4410,
d4422: d4422,
d5220: d5220,
d5232: d5232,
d5421: d5421,
d5433: d5433,
dedt: dedt,
didt: didt,
dmdt: dmdt,
dndt: dndt,
dnodt: dnodt,
domdt: domdt,
del1: del1,
del2: del2,
del3: del3,
xfact: xfact,
xlamo: xlamo,
xli: xli,
xni: xni
};
}

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@@ -1,244 +0,0 @@
/*!
* satellite-js v5.0.0
* (c) 2013 Shashwat Kandadai and UCSC
* https://github.com/shashwatak/satellite-js
* License: MIT
*/
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports["default"] = dspace;
var _constants = require("../constants");
/*-----------------------------------------------------------------------------
*
* procedure dspace
*
* this procedure provides deep space contributions to mean elements for
* perturbing third body. these effects have been averaged over one
* revolution of the sun and moon. for earth resonance effects, the
* effects have been averaged over no revolutions of the satellite.
* (mean motion)
*
* author : david vallado 719-573-2600 28 jun 2005
*
* inputs :
* d2201, d2211, d3210, d3222, d4410, d4422, d5220, d5232, d5421, d5433 -
* dedt -
* del1, del2, del3 -
* didt -
* dmdt -
* dnodt -
* domdt -
* irez - flag for resonance 0-none, 1-one day, 2-half day
* argpo - argument of perigee
* argpdot - argument of perigee dot (rate)
* t - time
* tc -
* gsto - gst
* xfact -
* xlamo -
* no - mean motion
* atime -
* em - eccentricity
* ft -
* argpm - argument of perigee
* inclm - inclination
* xli -
* mm - mean anomaly
* xni - mean motion
* nodem - right ascension of ascending node
*
* outputs :
* atime -
* em - eccentricity
* argpm - argument of perigee
* inclm - inclination
* xli -
* mm - mean anomaly
* xni -
* nodem - right ascension of ascending node
* dndt -
* nm - mean motion
*
* locals :
* delt -
* ft -
* theta -
* x2li -
* x2omi -
* xl -
* xldot -
* xnddt -
* xndt -
* xomi -
*
* coupling :
* none -
*
* references :
* hoots, roehrich, norad spacetrack report #3 1980
* hoots, norad spacetrack report #6 1986
* hoots, schumacher and glover 2004
* vallado, crawford, hujsak, kelso 2006
----------------------------------------------------------------------------*/
function dspace(options) {
var irez = options.irez,
d2201 = options.d2201,
d2211 = options.d2211,
d3210 = options.d3210,
d3222 = options.d3222,
d4410 = options.d4410,
d4422 = options.d4422,
d5220 = options.d5220,
d5232 = options.d5232,
d5421 = options.d5421,
d5433 = options.d5433,
dedt = options.dedt,
del1 = options.del1,
del2 = options.del2,
del3 = options.del3,
didt = options.didt,
dmdt = options.dmdt,
dnodt = options.dnodt,
domdt = options.domdt,
argpo = options.argpo,
argpdot = options.argpdot,
t = options.t,
tc = options.tc,
gsto = options.gsto,
xfact = options.xfact,
xlamo = options.xlamo,
no = options.no;
var atime = options.atime,
em = options.em,
argpm = options.argpm,
inclm = options.inclm,
xli = options.xli,
mm = options.mm,
xni = options.xni,
nodem = options.nodem,
nm = options.nm;
var fasx2 = 0.13130908;
var fasx4 = 2.8843198;
var fasx6 = 0.37448087;
var g22 = 5.7686396;
var g32 = 0.95240898;
var g44 = 1.8014998;
var g52 = 1.0508330;
var g54 = 4.4108898;
// eslint-disable-next-line no-loss-of-precision
var rptim = 4.37526908801129966e-3; // equates to 7.29211514668855e-5 rad/sec
var stepp = 720.0;
var stepn = -720.0;
var step2 = 259200.0;
var delt;
var x2li;
var x2omi;
var xl;
var xldot;
var xnddt;
var xndt;
var xomi;
var dndt = 0.0;
var ft = 0.0;
// ----------- calculate deep space resonance effects -----------
var theta = (gsto + tc * rptim) % _constants.twoPi;
em += dedt * t;
inclm += didt * t;
argpm += domdt * t;
nodem += dnodt * t;
mm += dmdt * t;
// sgp4fix for negative inclinations
// the following if statement should be commented out
// if (inclm < 0.0)
// {
// inclm = -inclm;
// argpm = argpm - pi;
// nodem = nodem + pi;
// }
/* - update resonances : numerical (euler-maclaurin) integration - */
/* ------------------------- epoch restart ---------------------- */
// sgp4fix for propagator problems
// the following integration works for negative time steps and periods
// the specific changes are unknown because the original code was so convoluted
// sgp4fix take out atime = 0.0 and fix for faster operation
if (irez !== 0) {
// sgp4fix streamline check
if (atime === 0.0 || t * atime <= 0.0 || Math.abs(t) < Math.abs(atime)) {
atime = 0.0;
xni = no;
xli = xlamo;
}
// sgp4fix move check outside loop
if (t > 0.0) {
delt = stepp;
} else {
delt = stepn;
}
var iretn = 381; // added for do loop
while (iretn === 381) {
// ------------------- dot terms calculated -------------
// ----------- near - synchronous resonance terms -------
if (irez !== 2) {
xndt = del1 * Math.sin(xli - fasx2) + del2 * Math.sin(2.0 * (xli - fasx4)) + del3 * Math.sin(3.0 * (xli - fasx6));
xldot = xni + xfact;
xnddt = del1 * Math.cos(xli - fasx2) + 2.0 * del2 * Math.cos(2.0 * (xli - fasx4)) + 3.0 * del3 * Math.cos(3.0 * (xli - fasx6));
xnddt *= xldot;
} else {
// --------- near - half-day resonance terms --------
xomi = argpo + argpdot * atime;
x2omi = xomi + xomi;
x2li = xli + xli;
xndt = d2201 * Math.sin(x2omi + xli - g22) + d2211 * Math.sin(xli - g22) + d3210 * Math.sin(xomi + xli - g32) + d3222 * Math.sin(-xomi + xli - g32) + d4410 * Math.sin(x2omi + x2li - g44) + d4422 * Math.sin(x2li - g44) + d5220 * Math.sin(xomi + xli - g52) + d5232 * Math.sin(-xomi + xli - g52) + d5421 * Math.sin(xomi + x2li - g54) + d5433 * Math.sin(-xomi + x2li - g54);
xldot = xni + xfact;
xnddt = d2201 * Math.cos(x2omi + xli - g22) + d2211 * Math.cos(xli - g22) + d3210 * Math.cos(xomi + xli - g32) + d3222 * Math.cos(-xomi + xli - g32) + d5220 * Math.cos(xomi + xli - g52) + d5232 * Math.cos(-xomi + xli - g52) + 2.0 * (d4410 * Math.cos(x2omi + x2li - g44) + d4422 * Math.cos(x2li - g44) + d5421 * Math.cos(xomi + x2li - g54) + d5433 * Math.cos(-xomi + x2li - g54));
xnddt *= xldot;
}
// ----------------------- integrator -------------------
// sgp4fix move end checks to end of routine
if (Math.abs(t - atime) >= stepp) {
iretn = 381;
} else {
ft = t - atime;
iretn = 0;
}
if (iretn === 381) {
xli += xldot * delt + xndt * step2;
xni += xndt * delt + xnddt * step2;
atime += delt;
}
}
nm = xni + xndt * ft + xnddt * ft * ft * 0.5;
xl = xli + xldot * ft + xndt * ft * ft * 0.5;
if (irez !== 1) {
mm = xl - 2.0 * nodem + 2.0 * theta;
dndt = nm - no;
} else {
mm = xl - nodem - argpm + theta;
dndt = nm - no;
}
nm = no + dndt;
}
return {
atime: atime,
em: em,
argpm: argpm,
inclm: inclm,
xli: xli,
mm: mm,
xni: xni,
nodem: nodem,
dndt: dndt,
nm: nm
};
}

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@@ -1,57 +0,0 @@
/*!
* satellite-js v5.0.0
* (c) 2013 Shashwat Kandadai and UCSC
* https://github.com/shashwatak/satellite-js
* License: MIT
*/
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports["default"] = gstime;
var _constants = require("../constants");
var _ext = require("../ext");
/* -----------------------------------------------------------------------------
*
* function gstime
*
* this function finds the greenwich sidereal time.
*
* author : david vallado 719-573-2600 1 mar 2001
*
* inputs description range / units
* jdut1 - julian date in ut1 days from 4713 bc
*
* outputs :
* gstime - greenwich sidereal time 0 to 2pi rad
*
* locals :
* temp - temporary variable for doubles rad
* tut1 - julian centuries from the
* jan 1, 2000 12 h epoch (ut1)
*
* coupling :
* none
*
* references :
* vallado 2004, 191, eq 3-45
* --------------------------------------------------------------------------- */
function gstimeInternal(jdut1) {
var tut1 = (jdut1 - 2451545.0) / 36525.0;
var temp = -6.2e-6 * tut1 * tut1 * tut1 + 0.093104 * tut1 * tut1 + (876600.0 * 3600 + 8640184.812866) * tut1 + 67310.54841; // # sec
temp = temp * _constants.deg2rad / 240.0 % _constants.twoPi; // 360/86400 = 1/240, to deg, to rad
// ------------------------ check quadrants ---------------------
if (temp < 0.0) {
temp += _constants.twoPi;
}
return temp;
}
function gstime() {
if ((arguments.length <= 0 ? undefined : arguments[0]) instanceof Date || arguments.length > 1) {
return gstimeInternal(_ext.jday.apply(void 0, arguments));
}
return gstimeInternal.apply(void 0, arguments);
}

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@@ -1,140 +0,0 @@
/*!
* satellite-js v5.0.0
* (c) 2013 Shashwat Kandadai and UCSC
* https://github.com/shashwatak/satellite-js
* License: MIT
*/
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports["default"] = initl;
var _constants = require("../constants");
var _gstime = _interopRequireDefault(require("./gstime"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
/*-----------------------------------------------------------------------------
*
* procedure initl
*
* this procedure initializes the sgp4 propagator. all the initialization is
* consolidated here instead of having multiple loops inside other routines.
*
* author : david vallado 719-573-2600 28 jun 2005
*
* inputs :
* ecco - eccentricity 0.0 - 1.0
* epoch - epoch time in days from jan 0, 1950. 0 hr
* inclo - inclination of satellite
* no - mean motion of satellite
* satn - satellite number
*
* outputs :
* ainv - 1.0 / a
* ao - semi major axis
* con41 -
* con42 - 1.0 - 5.0 cos(i)
* cosio - cosine of inclination
* cosio2 - cosio squared
* eccsq - eccentricity squared
* method - flag for deep space 'd', 'n'
* omeosq - 1.0 - ecco * ecco
* posq - semi-parameter squared
* rp - radius of perigee
* rteosq - square root of (1.0 - ecco*ecco)
* sinio - sine of inclination
* gsto - gst at time of observation rad
* no - mean motion of satellite
*
* locals :
* ak -
* d1 -
* del -
* adel -
* po -
*
* coupling :
* getgravconst
* gstime - find greenwich sidereal time from the julian date
*
* references :
* hoots, roehrich, norad spacetrack report #3 1980
* hoots, norad spacetrack report #6 1986
* hoots, schumacher and glover 2004
* vallado, crawford, hujsak, kelso 2006
----------------------------------------------------------------------------*/
function initl(options) {
var ecco = options.ecco,
epoch = options.epoch,
inclo = options.inclo,
opsmode = options.opsmode;
var no = options.no;
// sgp4fix use old way of finding gst
// ----------------------- earth constants ---------------------
// sgp4fix identify constants and allow alternate values
// ------------- calculate auxillary epoch quantities ----------
var eccsq = ecco * ecco;
var omeosq = 1.0 - eccsq;
var rteosq = Math.sqrt(omeosq);
var cosio = Math.cos(inclo);
var cosio2 = cosio * cosio;
// ------------------ un-kozai the mean motion -----------------
var ak = Math.pow(_constants.xke / no, _constants.x2o3);
var d1 = 0.75 * _constants.j2 * (3.0 * cosio2 - 1.0) / (rteosq * omeosq);
var delPrime = d1 / (ak * ak);
var adel = ak * (1.0 - delPrime * delPrime - delPrime * (1.0 / 3.0 + 134.0 * delPrime * delPrime / 81.0));
delPrime = d1 / (adel * adel);
no /= 1.0 + delPrime;
var ao = Math.pow(_constants.xke / no, _constants.x2o3);
var sinio = Math.sin(inclo);
var po = ao * omeosq;
var con42 = 1.0 - 5.0 * cosio2;
var con41 = -con42 - cosio2 - cosio2;
var ainv = 1.0 / ao;
var posq = po * po;
var rp = ao * (1.0 - ecco);
var method = 'n';
// sgp4fix modern approach to finding sidereal time
var gsto;
if (opsmode === 'a') {
// sgp4fix use old way of finding gst
// count integer number of days from 0 jan 1970
var ts70 = epoch - 7305.0;
var ds70 = Math.floor(ts70 + 1.0e-8);
var tfrac = ts70 - ds70;
// find greenwich location at epoch
var c1 = 1.72027916940703639e-2; // eslint-disable-line no-loss-of-precision
var thgr70 = 1.7321343856509374; // eslint-disable-line no-loss-of-precision
var fk5r = 5.07551419432269442e-15; // eslint-disable-line no-loss-of-precision
var c1p2p = c1 + _constants.twoPi;
gsto = (thgr70 + c1 * ds70 + c1p2p * tfrac + ts70 * ts70 * fk5r) % _constants.twoPi;
if (gsto < 0.0) {
gsto += _constants.twoPi;
}
} else {
gsto = (0, _gstime["default"])(epoch + 2433281.5);
}
return {
no: no,
method: method,
ainv: ainv,
ao: ao,
con41: con41,
con42: con42,
cosio: cosio,
cosio2: cosio2,
eccsq: eccsq,
omeosq: omeosq,
posq: posq,
rp: rp,
rteosq: rteosq,
sinio: sinio,
gsto: gsto
};
}

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@@ -1,34 +0,0 @@
/*!
* satellite-js v5.0.0
* (c) 2013 Shashwat Kandadai and UCSC
* https://github.com/shashwatak/satellite-js
* License: MIT
*/
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports["default"] = propagate;
var _constants = require("../constants");
var _ext = require("../ext");
var _sgp = _interopRequireDefault(require("./sgp4"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread(); }
function _nonIterableSpread() { throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
function _iterableToArray(iter) { if (typeof Symbol !== "undefined" && iter[Symbol.iterator] != null || iter["@@iterator"] != null) return Array.from(iter); }
function _arrayWithoutHoles(arr) { if (Array.isArray(arr)) return _arrayLikeToArray(arr); }
function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i]; return arr2; }
function propagate() {
for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
args[_key] = arguments[_key];
}
// Return a position and velocity vector for a given date and time.
var satrec = args[0];
var date = Array.prototype.slice.call(args, 1);
var j = _ext.jday.apply(void 0, _toConsumableArray(date));
var m = (j - satrec.jdsatepoch) * _constants.minutesPerDay;
return (0, _sgp["default"])(satrec, m);
}

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@@ -1,419 +0,0 @@
/*!
* satellite-js v5.0.0
* (c) 2013 Shashwat Kandadai and UCSC
* https://github.com/shashwatak/satellite-js
* License: MIT
*/
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports["default"] = sgp4;
var _constants = require("../constants");
var _dpper = _interopRequireDefault(require("./dpper"));
var _dspace = _interopRequireDefault(require("./dspace"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
/*----------------------------------------------------------------------------
*
* procedure sgp4
*
* this procedure is the sgp4 prediction model from space command. this is an
* updated and combined version of sgp4 and sdp4, which were originally
* published separately in spacetrack report //3. this version follows the
* methodology from the aiaa paper (2006) describing the history and
* development of the code.
*
* author : david vallado 719-573-2600 28 jun 2005
*
* inputs :
* satrec - initialised structure from sgp4init() call.
* tsince - time since epoch (minutes)
*
* outputs :
* r - position vector km
* v - velocity km/sec
* return code - non-zero on error.
* 1 - mean elements, ecc >= 1.0 or ecc < -0.001 or a < 0.95 er
* 2 - mean motion less than 0.0
* 3 - pert elements, ecc < 0.0 or ecc > 1.0
* 4 - semi-latus rectum < 0.0
* 5 - epoch elements are sub-orbital
* 6 - satellite has decayed
*
* locals :
* am -
* axnl, aynl -
* betal -
* cosim , sinim , cosomm , sinomm , cnod , snod , cos2u ,
* sin2u , coseo1 , sineo1 , cosi , sini , cosip , sinip ,
* cosisq , cossu , sinsu , cosu , sinu
* delm -
* delomg -
* dndt -
* eccm -
* emsq -
* ecose -
* el2 -
* eo1 -
* eccp -
* esine -
* argpm -
* argpp -
* omgadf -
* pl -
* r -
* rtemsq -
* rdotl -
* rl -
* rvdot -
* rvdotl -
* su -
* t2 , t3 , t4 , tc
* tem5, temp , temp1 , temp2 , tempa , tempe , templ
* u , ux , uy , uz , vx , vy , vz
* inclm - inclination
* mm - mean anomaly
* nm - mean motion
* nodem - right asc of ascending node
* xinc -
* xincp -
* xl -
* xlm -
* mp -
* xmdf -
* xmx -
* xmy -
* nodedf -
* xnode -
* nodep -
* np -
*
* coupling :
* getgravconst-
* dpper
* dspace
*
* references :
* hoots, roehrich, norad spacetrack report //3 1980
* hoots, norad spacetrack report //6 1986
* hoots, schumacher and glover 2004
* vallado, crawford, hujsak, kelso 2006
----------------------------------------------------------------------------*/
function sgp4(satrec, tsince) {
/* eslint-disable no-param-reassign */
var coseo1;
var sineo1;
var cosip;
var sinip;
var cosisq;
var delm;
var delomg;
var eo1;
var argpm;
var argpp;
var su;
var t3;
var t4;
var tc;
var tem5;
var temp;
var tempa;
var tempe;
var templ;
var inclm;
var mm;
var nm;
var nodem;
var xincp;
var xlm;
var mp;
var nodep;
/* ------------------ set mathematical constants --------------- */
// sgp4fix divisor for divide by zero check on inclination
// the old check used 1.0 + cos(pi-1.0e-9), but then compared it to
// 1.5 e-12, so the threshold was changed to 1.5e-12 for consistency
var temp4 = 1.5e-12;
// --------------------- clear sgp4 error flag -----------------
satrec.t = tsince;
satrec.error = 0;
// ------- update for secular gravity and atmospheric drag -----
var xmdf = satrec.mo + satrec.mdot * satrec.t;
var argpdf = satrec.argpo + satrec.argpdot * satrec.t;
var nodedf = satrec.nodeo + satrec.nodedot * satrec.t;
argpm = argpdf;
mm = xmdf;
var t2 = satrec.t * satrec.t;
nodem = nodedf + satrec.nodecf * t2;
tempa = 1.0 - satrec.cc1 * satrec.t;
tempe = satrec.bstar * satrec.cc4 * satrec.t;
templ = satrec.t2cof * t2;
if (satrec.isimp !== 1) {
delomg = satrec.omgcof * satrec.t;
// sgp4fix use mutliply for speed instead of pow
var delmtemp = 1.0 + satrec.eta * Math.cos(xmdf);
delm = satrec.xmcof * (delmtemp * delmtemp * delmtemp - satrec.delmo);
temp = delomg + delm;
mm = xmdf + temp;
argpm = argpdf - temp;
t3 = t2 * satrec.t;
t4 = t3 * satrec.t;
tempa = tempa - satrec.d2 * t2 - satrec.d3 * t3 - satrec.d4 * t4;
tempe += satrec.bstar * satrec.cc5 * (Math.sin(mm) - satrec.sinmao);
templ = templ + satrec.t3cof * t3 + t4 * (satrec.t4cof + satrec.t * satrec.t5cof);
}
nm = satrec.no;
var em = satrec.ecco;
inclm = satrec.inclo;
if (satrec.method === 'd') {
tc = satrec.t;
var dspaceOptions = {
irez: satrec.irez,
d2201: satrec.d2201,
d2211: satrec.d2211,
d3210: satrec.d3210,
d3222: satrec.d3222,
d4410: satrec.d4410,
d4422: satrec.d4422,
d5220: satrec.d5220,
d5232: satrec.d5232,
d5421: satrec.d5421,
d5433: satrec.d5433,
dedt: satrec.dedt,
del1: satrec.del1,
del2: satrec.del2,
del3: satrec.del3,
didt: satrec.didt,
dmdt: satrec.dmdt,
dnodt: satrec.dnodt,
domdt: satrec.domdt,
argpo: satrec.argpo,
argpdot: satrec.argpdot,
t: satrec.t,
tc: tc,
gsto: satrec.gsto,
xfact: satrec.xfact,
xlamo: satrec.xlamo,
no: satrec.no,
atime: satrec.atime,
em: em,
argpm: argpm,
inclm: inclm,
xli: satrec.xli,
mm: mm,
xni: satrec.xni,
nodem: nodem,
nm: nm
};
var dspaceResult = (0, _dspace["default"])(dspaceOptions);
em = dspaceResult.em;
argpm = dspaceResult.argpm;
inclm = dspaceResult.inclm;
mm = dspaceResult.mm;
nodem = dspaceResult.nodem;
nm = dspaceResult.nm;
}
if (nm <= 0.0) {
// printf("// error nm %f\n", nm);
satrec.error = 2;
// sgp4fix add return
return [false, false];
}
var am = Math.pow(_constants.xke / nm, _constants.x2o3) * tempa * tempa;
nm = _constants.xke / Math.pow(am, 1.5);
em -= tempe;
// fix tolerance for error recognition
// sgp4fix am is fixed from the previous nm check
if (em >= 1.0 || em < -0.001) {
// || (am < 0.95)
// printf("// error em %f\n", em);
satrec.error = 1;
// sgp4fix to return if there is an error in eccentricity
return [false, false];
}
// sgp4fix fix tolerance to avoid a divide by zero
if (em < 1.0e-6) {
em = 1.0e-6;
}
mm += satrec.no * templ;
xlm = mm + argpm + nodem;
nodem %= _constants.twoPi;
argpm %= _constants.twoPi;
xlm %= _constants.twoPi;
mm = (xlm - argpm - nodem) % _constants.twoPi;
// ----------------- compute extra mean quantities -------------
var sinim = Math.sin(inclm);
var cosim = Math.cos(inclm);
// -------------------- add lunar-solar periodics --------------
var ep = em;
xincp = inclm;
argpp = argpm;
nodep = nodem;
mp = mm;
sinip = sinim;
cosip = cosim;
if (satrec.method === 'd') {
var dpperParameters = {
inclo: satrec.inclo,
init: 'n',
ep: ep,
inclp: xincp,
nodep: nodep,
argpp: argpp,
mp: mp,
opsmode: satrec.operationmode
};
var dpperResult = (0, _dpper["default"])(satrec, dpperParameters);
ep = dpperResult.ep;
nodep = dpperResult.nodep;
argpp = dpperResult.argpp;
mp = dpperResult.mp;
xincp = dpperResult.inclp;
if (xincp < 0.0) {
xincp = -xincp;
nodep += _constants.pi;
argpp -= _constants.pi;
}
if (ep < 0.0 || ep > 1.0) {
// printf("// error ep %f\n", ep);
satrec.error = 3;
// sgp4fix add return
return [false, false];
}
}
// -------------------- long period periodics ------------------
if (satrec.method === 'd') {
sinip = Math.sin(xincp);
cosip = Math.cos(xincp);
satrec.aycof = -0.5 * _constants.j3oj2 * sinip;
// sgp4fix for divide by zero for xincp = 180 deg
if (Math.abs(cosip + 1.0) > 1.5e-12) {
satrec.xlcof = -0.25 * _constants.j3oj2 * sinip * (3.0 + 5.0 * cosip) / (1.0 + cosip);
} else {
satrec.xlcof = -0.25 * _constants.j3oj2 * sinip * (3.0 + 5.0 * cosip) / temp4;
}
}
var axnl = ep * Math.cos(argpp);
temp = 1.0 / (am * (1.0 - ep * ep));
var aynl = ep * Math.sin(argpp) + temp * satrec.aycof;
var xl = mp + argpp + nodep + temp * satrec.xlcof * axnl;
// --------------------- solve kepler's equation ---------------
var u = (xl - nodep) % _constants.twoPi;
eo1 = u;
tem5 = 9999.9;
var ktr = 1;
// sgp4fix for kepler iteration
// the following iteration needs better limits on corrections
while (Math.abs(tem5) >= 1.0e-12 && ktr <= 10) {
sineo1 = Math.sin(eo1);
coseo1 = Math.cos(eo1);
tem5 = 1.0 - coseo1 * axnl - sineo1 * aynl;
tem5 = (u - aynl * coseo1 + axnl * sineo1 - eo1) / tem5;
if (Math.abs(tem5) >= 0.95) {
if (tem5 > 0.0) {
tem5 = 0.95;
} else {
tem5 = -0.95;
}
}
eo1 += tem5;
ktr += 1;
}
// ------------- short period preliminary quantities -----------
var ecose = axnl * coseo1 + aynl * sineo1;
var esine = axnl * sineo1 - aynl * coseo1;
var el2 = axnl * axnl + aynl * aynl;
var pl = am * (1.0 - el2);
if (pl < 0.0) {
// printf("// error pl %f\n", pl);
satrec.error = 4;
// sgp4fix add return
return [false, false];
}
var rl = am * (1.0 - ecose);
var rdotl = Math.sqrt(am) * esine / rl;
var rvdotl = Math.sqrt(pl) / rl;
var betal = Math.sqrt(1.0 - el2);
temp = esine / (1.0 + betal);
var sinu = am / rl * (sineo1 - aynl - axnl * temp);
var cosu = am / rl * (coseo1 - axnl + aynl * temp);
su = Math.atan2(sinu, cosu);
var sin2u = (cosu + cosu) * sinu;
var cos2u = 1.0 - 2.0 * sinu * sinu;
temp = 1.0 / pl;
var temp1 = 0.5 * _constants.j2 * temp;
var temp2 = temp1 * temp;
// -------------- update for short period periodics ------------
if (satrec.method === 'd') {
cosisq = cosip * cosip;
satrec.con41 = 3.0 * cosisq - 1.0;
satrec.x1mth2 = 1.0 - cosisq;
satrec.x7thm1 = 7.0 * cosisq - 1.0;
}
var mrt = rl * (1.0 - 1.5 * temp2 * betal * satrec.con41) + 0.5 * temp1 * satrec.x1mth2 * cos2u;
// sgp4fix for decaying satellites
if (mrt < 1.0) {
// printf("// decay condition %11.6f \n",mrt);
satrec.error = 6;
return {
position: false,
velocity: false
};
}
su -= 0.25 * temp2 * satrec.x7thm1 * sin2u;
var xnode = nodep + 1.5 * temp2 * cosip * sin2u;
var xinc = xincp + 1.5 * temp2 * cosip * sinip * cos2u;
var mvt = rdotl - nm * temp1 * satrec.x1mth2 * sin2u / _constants.xke;
var rvdot = rvdotl + nm * temp1 * (satrec.x1mth2 * cos2u + 1.5 * satrec.con41) / _constants.xke;
// --------------------- orientation vectors -------------------
var sinsu = Math.sin(su);
var cossu = Math.cos(su);
var snod = Math.sin(xnode);
var cnod = Math.cos(xnode);
var sini = Math.sin(xinc);
var cosi = Math.cos(xinc);
var xmx = -snod * cosi;
var xmy = cnod * cosi;
var ux = xmx * sinsu + cnod * cossu;
var uy = xmy * sinsu + snod * cossu;
var uz = sini * sinsu;
var vx = xmx * cossu - cnod * sinsu;
var vy = xmy * cossu - snod * sinsu;
var vz = sini * cossu;
// --------- position and velocity (in km and km/sec) ----------
var r = {
x: mrt * ux * _constants.earthRadius,
y: mrt * uy * _constants.earthRadius,
z: mrt * uz * _constants.earthRadius
};
var v = {
x: (mvt * ux + rvdot * vx) * _constants.vkmpersec,
y: (mvt * uy + rvdot * vy) * _constants.vkmpersec,
z: (mvt * uz + rvdot * vz) * _constants.vkmpersec
};
return {
position: r,
velocity: v
};
/* eslint-enable no-param-reassign */
}

View File

@@ -1,645 +0,0 @@
/*!
* satellite-js v5.0.0
* (c) 2013 Shashwat Kandadai and UCSC
* https://github.com/shashwatak/satellite-js
* License: MIT
*/
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports["default"] = sgp4init;
var _constants = require("../constants");
var _dpper = _interopRequireDefault(require("./dpper"));
var _dscom = _interopRequireDefault(require("./dscom"));
var _dsinit = _interopRequireDefault(require("./dsinit"));
var _initl = _interopRequireDefault(require("./initl"));
var _sgp = _interopRequireDefault(require("./sgp4"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
/*-----------------------------------------------------------------------------
*
* procedure sgp4init
*
* this procedure initializes variables for sgp4.
*
* author : david vallado 719-573-2600 28 jun 2005
* author : david vallado 719-573-2600 28 jun 2005
*
* inputs :
* opsmode - mode of operation afspc or improved 'a', 'i'
* satn - satellite number
* bstar - sgp4 type drag coefficient kg/m2er
* ecco - eccentricity
* epoch - epoch time in days from jan 0, 1950. 0 hr
* argpo - argument of perigee (output if ds)
* inclo - inclination
* mo - mean anomaly (output if ds)
* no - mean motion
* nodeo - right ascension of ascending node
*
* outputs :
* rec - common values for subsequent calls
* return code - non-zero on error.
* 1 - mean elements, ecc >= 1.0 or ecc < -0.001 or a < 0.95 er
* 2 - mean motion less than 0.0
* 3 - pert elements, ecc < 0.0 or ecc > 1.0
* 4 - semi-latus rectum < 0.0
* 5 - epoch elements are sub-orbital
* 6 - satellite has decayed
*
* locals :
* cnodm , snodm , cosim , sinim , cosomm , sinomm
* cc1sq , cc2 , cc3
* coef , coef1
* cosio4 -
* day -
* dndt -
* em - eccentricity
* emsq - eccentricity squared
* eeta -
* etasq -
* gam -
* argpm - argument of perigee
* nodem -
* inclm - inclination
* mm - mean anomaly
* nm - mean motion
* perige - perigee
* pinvsq -
* psisq -
* qzms24 -
* rtemsq -
* s1, s2, s3, s4, s5, s6, s7 -
* sfour -
* ss1, ss2, ss3, ss4, ss5, ss6, ss7 -
* sz1, sz2, sz3
* sz11, sz12, sz13, sz21, sz22, sz23, sz31, sz32, sz33 -
* tc -
* temp -
* temp1, temp2, temp3 -
* tsi -
* xpidot -
* xhdot1 -
* z1, z2, z3 -
* z11, z12, z13, z21, z22, z23, z31, z32, z33 -
*
* coupling :
* getgravconst-
* initl -
* dscom -
* dpper -
* dsinit -
* sgp4 -
*
* references :
* hoots, roehrich, norad spacetrack report #3 1980
* hoots, norad spacetrack report #6 1986
* hoots, schumacher and glover 2004
* vallado, crawford, hujsak, kelso 2006
----------------------------------------------------------------------------*/
function sgp4init(satrec, options) {
/* eslint-disable no-param-reassign */
var opsmode = options.opsmode,
satn = options.satn,
epoch = options.epoch,
xbstar = options.xbstar,
xecco = options.xecco,
xargpo = options.xargpo,
xinclo = options.xinclo,
xmo = options.xmo,
xno = options.xno,
xnodeo = options.xnodeo;
var cosim;
var sinim;
var cc1sq;
var cc2;
var cc3;
var coef;
var coef1;
var cosio4;
var em;
var emsq;
var eeta;
var etasq;
var argpm;
var nodem;
var inclm;
var mm;
var nm;
var perige;
var pinvsq;
var psisq;
var qzms24;
var s1;
var s2;
var s3;
var s4;
var s5;
var sfour;
var ss1;
var ss2;
var ss3;
var ss4;
var ss5;
var sz1;
var sz3;
var sz11;
var sz13;
var sz21;
var sz23;
var sz31;
var sz33;
var tc;
var temp;
var temp1;
var temp2;
var temp3;
var tsi;
var xpidot;
var xhdot1;
var z1;
var z3;
var z11;
var z13;
var z21;
var z23;
var z31;
var z33;
/* ------------------------ initialization --------------------- */
// sgp4fix divisor for divide by zero check on inclination
// the old check used 1.0 + Math.cos(pi-1.0e-9), but then compared it to
// 1.5 e-12, so the threshold was changed to 1.5e-12 for consistency
var temp4 = 1.5e-12;
// ----------- set all near earth variables to zero ------------
satrec.isimp = 0;
satrec.method = 'n';
satrec.aycof = 0.0;
satrec.con41 = 0.0;
satrec.cc1 = 0.0;
satrec.cc4 = 0.0;
satrec.cc5 = 0.0;
satrec.d2 = 0.0;
satrec.d3 = 0.0;
satrec.d4 = 0.0;
satrec.delmo = 0.0;
satrec.eta = 0.0;
satrec.argpdot = 0.0;
satrec.omgcof = 0.0;
satrec.sinmao = 0.0;
satrec.t = 0.0;
satrec.t2cof = 0.0;
satrec.t3cof = 0.0;
satrec.t4cof = 0.0;
satrec.t5cof = 0.0;
satrec.x1mth2 = 0.0;
satrec.x7thm1 = 0.0;
satrec.mdot = 0.0;
satrec.nodedot = 0.0;
satrec.xlcof = 0.0;
satrec.xmcof = 0.0;
satrec.nodecf = 0.0;
// ----------- set all deep space variables to zero ------------
satrec.irez = 0;
satrec.d2201 = 0.0;
satrec.d2211 = 0.0;
satrec.d3210 = 0.0;
satrec.d3222 = 0.0;
satrec.d4410 = 0.0;
satrec.d4422 = 0.0;
satrec.d5220 = 0.0;
satrec.d5232 = 0.0;
satrec.d5421 = 0.0;
satrec.d5433 = 0.0;
satrec.dedt = 0.0;
satrec.del1 = 0.0;
satrec.del2 = 0.0;
satrec.del3 = 0.0;
satrec.didt = 0.0;
satrec.dmdt = 0.0;
satrec.dnodt = 0.0;
satrec.domdt = 0.0;
satrec.e3 = 0.0;
satrec.ee2 = 0.0;
satrec.peo = 0.0;
satrec.pgho = 0.0;
satrec.pho = 0.0;
satrec.pinco = 0.0;
satrec.plo = 0.0;
satrec.se2 = 0.0;
satrec.se3 = 0.0;
satrec.sgh2 = 0.0;
satrec.sgh3 = 0.0;
satrec.sgh4 = 0.0;
satrec.sh2 = 0.0;
satrec.sh3 = 0.0;
satrec.si2 = 0.0;
satrec.si3 = 0.0;
satrec.sl2 = 0.0;
satrec.sl3 = 0.0;
satrec.sl4 = 0.0;
satrec.gsto = 0.0;
satrec.xfact = 0.0;
satrec.xgh2 = 0.0;
satrec.xgh3 = 0.0;
satrec.xgh4 = 0.0;
satrec.xh2 = 0.0;
satrec.xh3 = 0.0;
satrec.xi2 = 0.0;
satrec.xi3 = 0.0;
satrec.xl2 = 0.0;
satrec.xl3 = 0.0;
satrec.xl4 = 0.0;
satrec.xlamo = 0.0;
satrec.zmol = 0.0;
satrec.zmos = 0.0;
satrec.atime = 0.0;
satrec.xli = 0.0;
satrec.xni = 0.0;
// sgp4fix - note the following variables are also passed directly via satrec.
// it is possible to streamline the sgp4init call by deleting the "x"
// variables, but the user would need to set the satrec.* values first. we
// include the additional assignments in case twoline2rv is not used.
satrec.bstar = xbstar;
satrec.ecco = xecco;
satrec.argpo = xargpo;
satrec.inclo = xinclo;
satrec.mo = xmo;
satrec.no = xno;
satrec.nodeo = xnodeo;
// sgp4fix add opsmode
satrec.operationmode = opsmode;
// ------------------------ earth constants -----------------------
// sgp4fix identify constants and allow alternate values
var ss = 78.0 / _constants.earthRadius + 1.0;
// sgp4fix use multiply for speed instead of pow
var qzms2ttemp = (120.0 - 78.0) / _constants.earthRadius;
var qzms2t = qzms2ttemp * qzms2ttemp * qzms2ttemp * qzms2ttemp;
satrec.init = 'y';
satrec.t = 0.0;
var initlOptions = {
satn: satn,
ecco: satrec.ecco,
epoch: epoch,
inclo: satrec.inclo,
no: satrec.no,
method: satrec.method,
opsmode: satrec.operationmode
};
var initlResult = (0, _initl["default"])(initlOptions);
var ao = initlResult.ao,
con42 = initlResult.con42,
cosio = initlResult.cosio,
cosio2 = initlResult.cosio2,
eccsq = initlResult.eccsq,
omeosq = initlResult.omeosq,
posq = initlResult.posq,
rp = initlResult.rp,
rteosq = initlResult.rteosq,
sinio = initlResult.sinio;
satrec.no = initlResult.no;
satrec.con41 = initlResult.con41;
satrec.gsto = initlResult.gsto;
satrec.a = Math.pow(satrec.no * _constants.tumin, -2.0 / 3.0);
satrec.alta = satrec.a * (1.0 + satrec.ecco) - 1.0;
satrec.altp = satrec.a * (1.0 - satrec.ecco) - 1.0;
satrec.error = 0;
// sgp4fix remove this check as it is unnecessary
// the mrt check in sgp4 handles decaying satellite cases even if the starting
// condition is below the surface of te earth
// if (rp < 1.0)
// {
// printf("// *** satn%d epoch elts sub-orbital ***\n", satn);
// satrec.error = 5;
// }
if (omeosq >= 0.0 || satrec.no >= 0.0) {
satrec.isimp = 0;
if (rp < 220.0 / _constants.earthRadius + 1.0) {
satrec.isimp = 1;
}
sfour = ss;
qzms24 = qzms2t;
perige = (rp - 1.0) * _constants.earthRadius;
// - for perigees below 156 km, s and qoms2t are altered -
if (perige < 156.0) {
sfour = perige - 78.0;
if (perige < 98.0) {
sfour = 20.0;
}
// sgp4fix use multiply for speed instead of pow
var qzms24temp = (120.0 - sfour) / _constants.earthRadius;
qzms24 = qzms24temp * qzms24temp * qzms24temp * qzms24temp;
sfour = sfour / _constants.earthRadius + 1.0;
}
pinvsq = 1.0 / posq;
tsi = 1.0 / (ao - sfour);
satrec.eta = ao * satrec.ecco * tsi;
etasq = satrec.eta * satrec.eta;
eeta = satrec.ecco * satrec.eta;
psisq = Math.abs(1.0 - etasq);
coef = qzms24 * Math.pow(tsi, 4.0);
coef1 = coef / Math.pow(psisq, 3.5);
cc2 = coef1 * satrec.no * (ao * (1.0 + 1.5 * etasq + eeta * (4.0 + etasq)) + 0.375 * _constants.j2 * tsi / psisq * satrec.con41 * (8.0 + 3.0 * etasq * (8.0 + etasq)));
satrec.cc1 = satrec.bstar * cc2;
cc3 = 0.0;
if (satrec.ecco > 1.0e-4) {
cc3 = -2.0 * coef * tsi * _constants.j3oj2 * satrec.no * sinio / satrec.ecco;
}
satrec.x1mth2 = 1.0 - cosio2;
satrec.cc4 = 2.0 * satrec.no * coef1 * ao * omeosq * (satrec.eta * (2.0 + 0.5 * etasq) + satrec.ecco * (0.5 + 2.0 * etasq) - _constants.j2 * tsi / (ao * psisq) * (-3.0 * satrec.con41 * (1.0 - 2.0 * eeta + etasq * (1.5 - 0.5 * eeta)) + 0.75 * satrec.x1mth2 * (2.0 * etasq - eeta * (1.0 + etasq)) * Math.cos(2.0 * satrec.argpo)));
satrec.cc5 = 2.0 * coef1 * ao * omeosq * (1.0 + 2.75 * (etasq + eeta) + eeta * etasq);
cosio4 = cosio2 * cosio2;
temp1 = 1.5 * _constants.j2 * pinvsq * satrec.no;
temp2 = 0.5 * temp1 * _constants.j2 * pinvsq;
temp3 = -0.46875 * _constants.j4 * pinvsq * pinvsq * satrec.no;
satrec.mdot = satrec.no + 0.5 * temp1 * rteosq * satrec.con41 + 0.0625 * temp2 * rteosq * (13.0 - 78.0 * cosio2 + 137.0 * cosio4);
satrec.argpdot = -0.5 * temp1 * con42 + 0.0625 * temp2 * (7.0 - 114.0 * cosio2 + 395.0 * cosio4) + temp3 * (3.0 - 36.0 * cosio2 + 49.0 * cosio4);
xhdot1 = -temp1 * cosio;
satrec.nodedot = xhdot1 + (0.5 * temp2 * (4.0 - 19.0 * cosio2) + 2.0 * temp3 * (3.0 - 7.0 * cosio2)) * cosio;
xpidot = satrec.argpdot + satrec.nodedot;
satrec.omgcof = satrec.bstar * cc3 * Math.cos(satrec.argpo);
satrec.xmcof = 0.0;
if (satrec.ecco > 1.0e-4) {
satrec.xmcof = -_constants.x2o3 * coef * satrec.bstar / eeta;
}
satrec.nodecf = 3.5 * omeosq * xhdot1 * satrec.cc1;
satrec.t2cof = 1.5 * satrec.cc1;
// sgp4fix for divide by zero with xinco = 180 deg
if (Math.abs(cosio + 1.0) > 1.5e-12) {
satrec.xlcof = -0.25 * _constants.j3oj2 * sinio * (3.0 + 5.0 * cosio) / (1.0 + cosio);
} else {
satrec.xlcof = -0.25 * _constants.j3oj2 * sinio * (3.0 + 5.0 * cosio) / temp4;
}
satrec.aycof = -0.5 * _constants.j3oj2 * sinio;
// sgp4fix use multiply for speed instead of pow
var delmotemp = 1.0 + satrec.eta * Math.cos(satrec.mo);
satrec.delmo = delmotemp * delmotemp * delmotemp;
satrec.sinmao = Math.sin(satrec.mo);
satrec.x7thm1 = 7.0 * cosio2 - 1.0;
// --------------- deep space initialization -------------
if (2 * _constants.pi / satrec.no >= 225.0) {
satrec.method = 'd';
satrec.isimp = 1;
tc = 0.0;
inclm = satrec.inclo;
var dscomOptions = {
epoch: epoch,
ep: satrec.ecco,
argpp: satrec.argpo,
tc: tc,
inclp: satrec.inclo,
nodep: satrec.nodeo,
np: satrec.no,
e3: satrec.e3,
ee2: satrec.ee2,
peo: satrec.peo,
pgho: satrec.pgho,
pho: satrec.pho,
pinco: satrec.pinco,
plo: satrec.plo,
se2: satrec.se2,
se3: satrec.se3,
sgh2: satrec.sgh2,
sgh3: satrec.sgh3,
sgh4: satrec.sgh4,
sh2: satrec.sh2,
sh3: satrec.sh3,
si2: satrec.si2,
si3: satrec.si3,
sl2: satrec.sl2,
sl3: satrec.sl3,
sl4: satrec.sl4,
xgh2: satrec.xgh2,
xgh3: satrec.xgh3,
xgh4: satrec.xgh4,
xh2: satrec.xh2,
xh3: satrec.xh3,
xi2: satrec.xi2,
xi3: satrec.xi3,
xl2: satrec.xl2,
xl3: satrec.xl3,
xl4: satrec.xl4,
zmol: satrec.zmol,
zmos: satrec.zmos
};
var dscomResult = (0, _dscom["default"])(dscomOptions);
satrec.e3 = dscomResult.e3;
satrec.ee2 = dscomResult.ee2;
satrec.peo = dscomResult.peo;
satrec.pgho = dscomResult.pgho;
satrec.pho = dscomResult.pho;
satrec.pinco = dscomResult.pinco;
satrec.plo = dscomResult.plo;
satrec.se2 = dscomResult.se2;
satrec.se3 = dscomResult.se3;
satrec.sgh2 = dscomResult.sgh2;
satrec.sgh3 = dscomResult.sgh3;
satrec.sgh4 = dscomResult.sgh4;
satrec.sh2 = dscomResult.sh2;
satrec.sh3 = dscomResult.sh3;
satrec.si2 = dscomResult.si2;
satrec.si3 = dscomResult.si3;
satrec.sl2 = dscomResult.sl2;
satrec.sl3 = dscomResult.sl3;
satrec.sl4 = dscomResult.sl4;
sinim = dscomResult.sinim;
cosim = dscomResult.cosim;
em = dscomResult.em;
emsq = dscomResult.emsq;
s1 = dscomResult.s1;
s2 = dscomResult.s2;
s3 = dscomResult.s3;
s4 = dscomResult.s4;
s5 = dscomResult.s5;
ss1 = dscomResult.ss1;
ss2 = dscomResult.ss2;
ss3 = dscomResult.ss3;
ss4 = dscomResult.ss4;
ss5 = dscomResult.ss5;
sz1 = dscomResult.sz1;
sz3 = dscomResult.sz3;
sz11 = dscomResult.sz11;
sz13 = dscomResult.sz13;
sz21 = dscomResult.sz21;
sz23 = dscomResult.sz23;
sz31 = dscomResult.sz31;
sz33 = dscomResult.sz33;
satrec.xgh2 = dscomResult.xgh2;
satrec.xgh3 = dscomResult.xgh3;
satrec.xgh4 = dscomResult.xgh4;
satrec.xh2 = dscomResult.xh2;
satrec.xh3 = dscomResult.xh3;
satrec.xi2 = dscomResult.xi2;
satrec.xi3 = dscomResult.xi3;
satrec.xl2 = dscomResult.xl2;
satrec.xl3 = dscomResult.xl3;
satrec.xl4 = dscomResult.xl4;
satrec.zmol = dscomResult.zmol;
satrec.zmos = dscomResult.zmos;
nm = dscomResult.nm;
z1 = dscomResult.z1;
z3 = dscomResult.z3;
z11 = dscomResult.z11;
z13 = dscomResult.z13;
z21 = dscomResult.z21;
z23 = dscomResult.z23;
z31 = dscomResult.z31;
z33 = dscomResult.z33;
var dpperOptions = {
inclo: inclm,
init: satrec.init,
ep: satrec.ecco,
inclp: satrec.inclo,
nodep: satrec.nodeo,
argpp: satrec.argpo,
mp: satrec.mo,
opsmode: satrec.operationmode
};
var dpperResult = (0, _dpper["default"])(satrec, dpperOptions);
satrec.ecco = dpperResult.ep;
satrec.inclo = dpperResult.inclp;
satrec.nodeo = dpperResult.nodep;
satrec.argpo = dpperResult.argpp;
satrec.mo = dpperResult.mp;
argpm = 0.0;
nodem = 0.0;
mm = 0.0;
var dsinitOptions = {
cosim: cosim,
emsq: emsq,
argpo: satrec.argpo,
s1: s1,
s2: s2,
s3: s3,
s4: s4,
s5: s5,
sinim: sinim,
ss1: ss1,
ss2: ss2,
ss3: ss3,
ss4: ss4,
ss5: ss5,
sz1: sz1,
sz3: sz3,
sz11: sz11,
sz13: sz13,
sz21: sz21,
sz23: sz23,
sz31: sz31,
sz33: sz33,
t: satrec.t,
tc: tc,
gsto: satrec.gsto,
mo: satrec.mo,
mdot: satrec.mdot,
no: satrec.no,
nodeo: satrec.nodeo,
nodedot: satrec.nodedot,
xpidot: xpidot,
z1: z1,
z3: z3,
z11: z11,
z13: z13,
z21: z21,
z23: z23,
z31: z31,
z33: z33,
ecco: satrec.ecco,
eccsq: eccsq,
em: em,
argpm: argpm,
inclm: inclm,
mm: mm,
nm: nm,
nodem: nodem,
irez: satrec.irez,
atime: satrec.atime,
d2201: satrec.d2201,
d2211: satrec.d2211,
d3210: satrec.d3210,
d3222: satrec.d3222,
d4410: satrec.d4410,
d4422: satrec.d4422,
d5220: satrec.d5220,
d5232: satrec.d5232,
d5421: satrec.d5421,
d5433: satrec.d5433,
dedt: satrec.dedt,
didt: satrec.didt,
dmdt: satrec.dmdt,
dnodt: satrec.dnodt,
domdt: satrec.domdt,
del1: satrec.del1,
del2: satrec.del2,
del3: satrec.del3,
xfact: satrec.xfact,
xlamo: satrec.xlamo,
xli: satrec.xli,
xni: satrec.xni
};
var dsinitResult = (0, _dsinit["default"])(dsinitOptions);
satrec.irez = dsinitResult.irez;
satrec.atime = dsinitResult.atime;
satrec.d2201 = dsinitResult.d2201;
satrec.d2211 = dsinitResult.d2211;
satrec.d3210 = dsinitResult.d3210;
satrec.d3222 = dsinitResult.d3222;
satrec.d4410 = dsinitResult.d4410;
satrec.d4422 = dsinitResult.d4422;
satrec.d5220 = dsinitResult.d5220;
satrec.d5232 = dsinitResult.d5232;
satrec.d5421 = dsinitResult.d5421;
satrec.d5433 = dsinitResult.d5433;
satrec.dedt = dsinitResult.dedt;
satrec.didt = dsinitResult.didt;
satrec.dmdt = dsinitResult.dmdt;
satrec.dnodt = dsinitResult.dnodt;
satrec.domdt = dsinitResult.domdt;
satrec.del1 = dsinitResult.del1;
satrec.del2 = dsinitResult.del2;
satrec.del3 = dsinitResult.del3;
satrec.xfact = dsinitResult.xfact;
satrec.xlamo = dsinitResult.xlamo;
satrec.xli = dsinitResult.xli;
satrec.xni = dsinitResult.xni;
}
// ----------- set variables if not deep space -----------
if (satrec.isimp !== 1) {
cc1sq = satrec.cc1 * satrec.cc1;
satrec.d2 = 4.0 * ao * tsi * cc1sq;
temp = satrec.d2 * tsi * satrec.cc1 / 3.0;
satrec.d3 = (17.0 * ao + sfour) * temp;
satrec.d4 = 0.5 * temp * ao * tsi * (221.0 * ao + 31.0 * sfour) * satrec.cc1;
satrec.t3cof = satrec.d2 + 2.0 * cc1sq;
satrec.t4cof = 0.25 * (3.0 * satrec.d3 + satrec.cc1 * (12.0 * satrec.d2 + 10.0 * cc1sq));
satrec.t5cof = 0.2 * (3.0 * satrec.d4 + 12.0 * satrec.cc1 * satrec.d3 + 6.0 * satrec.d2 * satrec.d2 + 15.0 * cc1sq * (2.0 * satrec.d2 + cc1sq));
}
/* finally propogate to zero epoch to initialize all others. */
// sgp4fix take out check to let satellites process until they are actually below earth surface
// if(satrec.error == 0)
}
(0, _sgp["default"])(satrec, 0, 0);
satrec.init = 'n';
/* eslint-enable no-param-reassign */
}

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@@ -1,186 +0,0 @@
/*!
* satellite-js v5.0.0
* (c) 2013 Shashwat Kandadai and UCSC
* https://github.com/shashwatak/satellite-js
* License: MIT
*/
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.degreesLat = degreesLat;
exports.degreesLong = degreesLong;
exports.degreesToRadians = degreesToRadians;
exports.ecfToEci = ecfToEci;
exports.ecfToLookAngles = ecfToLookAngles;
exports.eciToEcf = eciToEcf;
exports.eciToGeodetic = eciToGeodetic;
exports.geodeticToEcf = geodeticToEcf;
exports.radiansLat = radiansLat;
exports.radiansLong = radiansLong;
exports.radiansToDegrees = radiansToDegrees;
var _constants = require("./constants");
function radiansToDegrees(radians) {
return radians * _constants.rad2deg;
}
function degreesToRadians(degrees) {
return degrees * _constants.deg2rad;
}
function degreesLat(radians) {
if (radians < -_constants.pi / 2 || radians > _constants.pi / 2) {
throw new RangeError('Latitude radians must be in range [-pi/2; pi/2].');
}
return radiansToDegrees(radians);
}
function degreesLong(radians) {
if (radians < -_constants.pi || radians > _constants.pi) {
throw new RangeError('Longitude radians must be in range [-pi; pi].');
}
return radiansToDegrees(radians);
}
function radiansLat(degrees) {
if (degrees < -90 || degrees > 90) {
throw new RangeError('Latitude degrees must be in range [-90; 90].');
}
return degreesToRadians(degrees);
}
function radiansLong(degrees) {
if (degrees < -180 || degrees > 180) {
throw new RangeError('Longitude degrees must be in range [-180; 180].');
}
return degreesToRadians(degrees);
}
function geodeticToEcf(geodetic) {
var longitude = geodetic.longitude,
latitude = geodetic.latitude,
height = geodetic.height;
var a = 6378.137;
var b = 6356.7523142;
var f = (a - b) / a;
var e2 = 2 * f - f * f;
var normal = a / Math.sqrt(1 - e2 * (Math.sin(latitude) * Math.sin(latitude)));
var x = (normal + height) * Math.cos(latitude) * Math.cos(longitude);
var y = (normal + height) * Math.cos(latitude) * Math.sin(longitude);
var z = (normal * (1 - e2) + height) * Math.sin(latitude);
return {
x: x,
y: y,
z: z
};
}
function eciToGeodetic(eci, gmst) {
// http://www.celestrak.com/columns/v02n03/
var a = 6378.137;
var b = 6356.7523142;
var R = Math.sqrt(eci.x * eci.x + eci.y * eci.y);
var f = (a - b) / a;
var e2 = 2 * f - f * f;
var longitude = Math.atan2(eci.y, eci.x) - gmst;
while (longitude < -_constants.pi) {
longitude += _constants.twoPi;
}
while (longitude > _constants.pi) {
longitude -= _constants.twoPi;
}
var kmax = 20;
var k = 0;
var latitude = Math.atan2(eci.z, Math.sqrt(eci.x * eci.x + eci.y * eci.y));
var C;
while (k < kmax) {
C = 1 / Math.sqrt(1 - e2 * (Math.sin(latitude) * Math.sin(latitude)));
latitude = Math.atan2(eci.z + a * C * e2 * Math.sin(latitude), R);
k += 1;
}
var height = R / Math.cos(latitude) - a * C;
return {
longitude: longitude,
latitude: latitude,
height: height
};
}
function ecfToEci(ecf, gmst) {
// ccar.colorado.edu/ASEN5070/handouts/coordsys.doc
//
// [X] [C -S 0][X]
// [Y] = [S C 0][Y]
// [Z]eci [0 0 1][Z]ecf
//
var X = ecf.x * Math.cos(gmst) - ecf.y * Math.sin(gmst);
var Y = ecf.x * Math.sin(gmst) + ecf.y * Math.cos(gmst);
var Z = ecf.z;
return {
x: X,
y: Y,
z: Z
};
}
function eciToEcf(eci, gmst) {
// ccar.colorado.edu/ASEN5070/handouts/coordsys.doc
//
// [X] [C -S 0][X]
// [Y] = [S C 0][Y]
// [Z]eci [0 0 1][Z]ecf
//
//
// Inverse:
// [X] [C S 0][X]
// [Y] = [-S C 0][Y]
// [Z]ecf [0 0 1][Z]eci
var x = eci.x * Math.cos(gmst) + eci.y * Math.sin(gmst);
var y = eci.x * -Math.sin(gmst) + eci.y * Math.cos(gmst);
var z = eci.z;
return {
x: x,
y: y,
z: z
};
}
function topocentric(observerGeodetic, satelliteEcf) {
// http://www.celestrak.com/columns/v02n02/
// TS Kelso's method, except I'm using ECF frame
// and he uses ECI.
var longitude = observerGeodetic.longitude,
latitude = observerGeodetic.latitude;
var observerEcf = geodeticToEcf(observerGeodetic);
var rx = satelliteEcf.x - observerEcf.x;
var ry = satelliteEcf.y - observerEcf.y;
var rz = satelliteEcf.z - observerEcf.z;
var topS = Math.sin(latitude) * Math.cos(longitude) * rx + Math.sin(latitude) * Math.sin(longitude) * ry - Math.cos(latitude) * rz;
var topE = -Math.sin(longitude) * rx + Math.cos(longitude) * ry;
var topZ = Math.cos(latitude) * Math.cos(longitude) * rx + Math.cos(latitude) * Math.sin(longitude) * ry + Math.sin(latitude) * rz;
return {
topS: topS,
topE: topE,
topZ: topZ
};
}
/**
* @param {Object} tc
* @param {Number} tc.topS Positive horizontal vector S due south.
* @param {Number} tc.topE Positive horizontal vector E due east.
* @param {Number} tc.topZ Vector Z normal to the surface of the earth (up).
* @returns {Object}
*/
function topocentricToLookAngles(tc) {
var topS = tc.topS,
topE = tc.topE,
topZ = tc.topZ;
var rangeSat = Math.sqrt(topS * topS + topE * topE + topZ * topZ);
var El = Math.asin(topZ / rangeSat);
var Az = Math.atan2(-topE, topS) + _constants.pi;
return {
azimuth: Az,
elevation: El,
rangeSat: rangeSat // Range in km
};
}
function ecfToLookAngles(observerGeodetic, satelliteEcf) {
var topocentricCoords = topocentric(observerGeodetic, satelliteEcf);
return topocentricToLookAngles(topocentricCoords);
}

View File

@@ -1,80 +0,0 @@
{
"name": "satellite.js",
"version": "5.0.0",
"description": "SGP4/SDP4 calculation library",
"main": "lib/index.js",
"jsnext:main": "dist/satellite.es.js",
"types": "types/index.d.ts",
"module": "dist/satellite.es.js",
"scripts": {
"build": "rimraf lib dist && npm run transpile && npm run dist",
"transpile": "babel src --out-dir lib --ignore indexUmd.js && node --require @babel/register commands/add-copyright.js 'lib/**/*.js'",
"dist": "npm run dist:es && npm run dist:umd:dev && npm run dist:umd:prod",
"dist:es": "rollup --bundleConfigAsCjs --config rollup.config.es.js && node --require @babel/register commands/add-copyright.js 'dist/satellite.es.js'",
"dist:umd": "rollup --bundleConfigAsCjs --config rollup.config.js",
"dist:umd:dev": "cross-env NODE_ENV=development npm run dist:umd && node --require @babel/register commands/add-copyright.js 'dist/**/satellite.js'",
"dist:umd:prod": "cross-env NODE_ENV=production npm run dist:umd && node --require @babel/register commands/add-copyright.js 'dist/**/satellite.min.js'",
"watch:es": "node --require @babel/register rollup.watch.es.js",
"copy": "copyfiles -u 1 'dist/**/*' sgp4_verification/lib/sgp4",
"lint": "eslint src",
"lint:test": "eslint test",
"test": "jest",
"test:coverage": "jest --coverage",
"test:coveralls": "npm run test:coverage && cat coverage/lcov.info | coveralls",
"raise": "raise-version",
"prepublishOnly": "npm run lint && npm run lint:test && npm test && npm run build"
},
"repository": {
"type": "git",
"url": "git://github.com/shashwatak/satellite-js"
},
"keywords": [
"sgp4",
"satellite"
],
"author": "Shashwat Kandadai <shashwatak@gmail.com> (https://github.com/shashwatak)",
"contributors": [
"Dmitriy Pushkov <ezze@ezze.org> (http://www.ezze.org)"
],
"license": "MIT",
"bugs": {
"url": "https://github.com/shashwatak/satellite-js/issues"
},
"dependencies": {},
"devDependencies": {
"@babel/cli": "^7.20.7",
"@babel/core": "^7.20.12",
"@babel/plugin-proposal-class-properties": "^7.18.6",
"@babel/plugin-proposal-json-strings": "^7.18.6",
"@babel/plugin-syntax-dynamic-import": "^7.8.3",
"@babel/plugin-syntax-import-meta": "^7.10.4",
"@babel/preset-env": "^7.20.2",
"@babel/register": "^7.18.9",
"@rollup/plugin-babel": "^6.0.3",
"@rollup/plugin-terser": "^0.2.1",
"chokidar": "^3.5.3",
"copyfiles": "^2.4.1",
"coveralls": "^3.1.1",
"cross-env": "^7.0.3",
"eslint": "^8.31.0",
"eslint-config-airbnb-base": "^15.0.0",
"eslint-plugin-import": "^2.26.0",
"glob": "^8.0.3",
"jest": "^29.3.1",
"prepend-file": "^2.0.1",
"raise-version": "^0.5.0",
"rimraf": "^3.0.2",
"rollup": "^3.9.1"
},
"jest": {
"testPathIgnorePatterns": [
"node_modules",
"test/propagation/sgp4prop"
]
},
"homepage": "https://github.com/shashwatak/satellite-js",
"directories": {
"lib": "lib",
"test": "test"
}
}

View File

@@ -1,223 +0,0 @@
declare module 'satellite.js' {
/**
* Satellite record containing description of orbit.
*/
export interface SatRec {
/**
* Unique satellite number given in the TLE file.
*/
satnum: string;
/**
* Full four-digit year of this element set's epoch moment.
*/
epochyr: number;
/**
* Fractional days into the year of the epoch moment.
*/
epochdays: number;
/**
* Julian date of the epoch (computed from epochyr and epochdays).
*/
jdsatepoch: number;
/**
* First time derivative of the mean motion (ignored by SGP4).
*/
ndot: number;
/**
* Second time derivative of the mean motion (ignored by SGP4).
*/
nddot: number;
/**
* Ballistic drag coefficient B* in inverse earth radii.
*/
bstar: number;
/**
* Inclination in radians.
*/
inclo: number;
/**
* Right ascension of ascending node in radians.
*/
nodeo: number;
/**
* Eccentricity.
*/
ecco: number;
/**
* Argument of perigee in radians.
*/
argpo: number;
/**
* Mean anomaly in radians.
*/
mo: number;
/**
* Mean motion in radians per minute.
*/
no: number;
/**
* Error code indicating propagation failure type.
*/
error: number;
}
/**
* Initialize a satellite record
*/
export function twoline2satrec(tleLine1: string, tleLine2: string): SatRec;
/**
* Coordinate frame Earth Centered Inertial (ECI)
* https://en.wikipedia.org/wiki/Earth-centered_inertial
*/
export interface EciVec3<T> {
x: T;
y: T;
z: T;
}
/**
* Coordinate frame Earth Centered Fixed (ECF)
* https://en.wikipedia.org/wiki/ECEF
*/
export interface EcfVec3<T> {
x: T;
y: T;
z: T;
}
/**
* Type alias documents units are kilometer (km)
*/
export type Kilometer = number;
/**
* Type alias documents units are kilometer per second (km/s)
*/
export type KilometerPerSecond = number;
/**
* The position_velocity result is a key-value pair of ECI coordinates.
* These are the base results from which all other coordinates are derived.
* If there is an error the position and velocity will be false.
*/
export interface PositionAndVelocity {
position: EciVec3<Kilometer>|boolean;
velocity: EciVec3<KilometerPerSecond>|boolean;
}
/**
* Propagate satellite using time since epoch (in minutes).
*/
export function sgp4(satrec: SatRec, timeSinceTleEpochMinutes: number): PositionAndVelocity;
/**
* Propagate satellite using time as JavaScript Date.
*/
export function propagate(satrec: SatRec, date: Date): PositionAndVelocity;
/**
* Type alias documents units are radians
*/
export type Radians = number;
/**
* Type alias documents units are degrees
*/
export type Degrees = number;
/**
* Convert number in degrees to number in radians
* @param value Number to convert
*/
export function degreesToRadians(value: Degrees): Radians;
/**
* https://en.wikipedia.org/wiki/Geographic_coordinate_system#Latitude_and_longitude
*/
export interface GeodeticLocation {
longitude: Radians;
latitude: Radians;
height: Kilometer;
}
/**
* You will need GMST for some of the coordinate transforms.
* GMST - Greenwich Mean Sidereal Time
* http://en.wikipedia.org/wiki/Sidereal_time#Definition
*/
export type GMSTime = number;
/**
* Convert values to GMST. Accepts either a Date object, a Julian date number, or individual date and time
* component values. If individual values are specified, all but `msec` are required.
* @param dateYearArg Can be a Date, Julian date, or the year number for
* @param month Zero-based month number
* @param day Day of month
* @param hour Hour of day, based on 24 hour clock
* @param minute Minute(s)
* @param second Second(s)
* @param msec Optional milliseconds
*/
export function gstime(
dateYearArg: number | Date,
month?: number,
day?: number,
hour?: number,
minute?: number,
second?: number,
msec?: number): GMSTime;
/**
* Convert ECI to ECF. Units are not modified.
*/
export function eciToEcf<T>(positionEci: EciVec3<T>, gmst: GMSTime): EcfVec3<T>;
/**
* Convert ECF to ECI. Units are not modified.
*/
export function ecfToEci<T>(positionEcf: EcfVec3<T>, gmst: GMSTime): EciVec3<T>;
/**
* Convert geodetic location to ECF
*/
export function geodeticToEcf(observerGd: GeodeticLocation): EcfVec3<Kilometer>;
/**
* Convert ECI to geodetic location
*/
export function eciToGeodetic(positionEci: EciVec3<Kilometer>, gmst: GMSTime): GeodeticLocation;
/**
* https://en.wikipedia.org/wiki/Azimuth
*/
export interface LookAngles {
azimuth: Radians;
elevation: Radians;
rangeSat: Kilometer;
}
/**
* Convert ECF to look angles
*/
export function ecfToLookAngles(observerGd: GeodeticLocation, positionEcf: EcfVec3<Kilometer>): LookAngles;
/**
* Compute doppler factor between observer and satellite with position and velocity.
*/
export function dopplerFactor(
observerCoordsEcf: EcfVec3<Kilometer>,
positionEcf: EcfVec3<Kilometer>,
velocityEcf: EcfVec3<KilometerPerSecond>
): number;
/**
* Convert the longitude in RADIANS to DEGREES.
*/
export function degreesLong(longitude: Radians): number;
/**
* Convert the latitude in RADIANS to DEGREES.
*/
export function degreesLat(latitude: Radians): number;
}