ootk
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Orbital Object Toolkit including Multiple Propagators, Initial Orbit Determination, and Maneuver Calculations.
59 lines • 2.55 kB
JavaScript
/**
* @author @thkruz Theodore Kruczek
* @description Orbital Object ToolKit (ootk) is a collection of tools for working
* with satellites and other orbital objects.
* @license AGPL-3.0-or-later
* @copyright (c) 2025 Kruczek Labs LLC
*
* Many of the classes are based off of the work of @david-rc-dayton and his
* Pious Squid library (https://github.com/david-rc-dayton/pious_squid) which
* is licensed under the MIT license.
*
* Orbital Object ToolKit is free software: you can redistribute it and/or modify it under the
* terms of the GNU Affero General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later version.
*
* Orbital Object ToolKit is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License along with
* Orbital Object ToolKit. If not, see <http://www.gnu.org/licenses/>.
*/
import { Celestial, ecf2eci, jday, MILLISECONDS_TO_DAYS, rae2ecf, Sgp4, SpaceObjectType, } from '../main.js';
import { BaseObject } from './BaseObject.js';
export class Star extends BaseObject {
ra;
dec;
bf;
h;
pname;
vmag;
constructor(info) {
super(info);
this.type = SpaceObjectType.STAR;
this.ra = info.ra;
this.dec = info.dec;
this.pname = info.pname ?? '';
this.bf = info.bf ?? '';
this.h = info.h ?? '';
this.vmag = info.vmag;
}
eci(lla = { lat: 180, lon: 0, alt: 0 }, date = new Date()) {
const rae = this.rae(lla, date);
const { gmst } = Star.calculateTimeVariables_(date);
// Arbitrary distance to enable using ECI coordinates
return ecf2eci(rae2ecf(rae, { lat: 0, lon: 0, alt: 0 }), gmst);
}
rae(lla = { lat: 180, lon: 0, alt: 0 }, date = new Date()) {
const starPos = Celestial.azEl(date, lla.lat, lla.lon, this.ra, this.dec);
return { az: starPos.az, el: starPos.el, rng: 250000 };
}
static calculateTimeVariables_(date) {
const j = jday(date.getUTCFullYear(), date.getUTCMonth() + 1, date.getUTCDate(), date.getUTCHours(), date.getUTCMinutes(), date.getUTCSeconds()) +
date.getUTCMilliseconds() * MILLISECONDS_TO_DAYS;
const gmst = Sgp4.gstime(j);
return { gmst, j };
}
}
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