ootk-core
Version:
Orbital Object Toolkit. A modern typed replacement for satellite.js including SGP4 propagation, TLE parsing, Sun and Moon calculations, and more.
38 lines • 1.86 kB
JavaScript
/**
* @author Theodore Kruczek.
* @license MIT
* @copyright (c) 2022-2025 Theodore Kruczek 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.
*/
import { Vector3D } from '../operations/Vector3D.js';
export const radecToPosition = (ra, dec, r) => {
const ca = Math.cos(ra);
const sa = Math.sin(ra);
const cd = Math.cos(dec);
const sd = Math.sin(dec);
return new Vector3D(r * cd * ca, r * cd * sa, r * sd);
};
export const radecToVelocity = (ra, dec, r, raDot, decDot, rDot) => {
const ca = Math.cos(ra);
const sa = Math.sin(ra);
const cd = Math.cos(dec);
const sd = Math.sin(dec);
return new Vector3D(rDot * cd * ca - r * sd * ca * decDot - r * cd * sa * raDot, rDot * cd * sa - r * sd * sa * decDot + r * cd * ca * raDot, rDot * sd + r * cd * decDot);
};
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