191 lines
6.0 KiB
JavaScript
191 lines
6.0 KiB
JavaScript
'use strict';
|
|
|
|
Object.defineProperty(exports, '__esModule', { value: true });
|
|
|
|
var base = require('./base.cjs');
|
|
|
|
/**
|
|
* @copyright 2013 Sonia Keys
|
|
* @copyright 2016 commenthol
|
|
* @license MIT
|
|
* @module planetelements
|
|
*/
|
|
|
|
// planet names used in cMean
|
|
const mercury = 'mercury';
|
|
const venus = 'venus';
|
|
const earth = 'earth';
|
|
const mars = 'mars';
|
|
const jupiter = 'jupiter';
|
|
const saturn = 'saturn';
|
|
const uranus = 'uranus';
|
|
const neptune = 'neptune';
|
|
|
|
/**
|
|
* Elements contains orbital elements as returned by functions in this package.
|
|
*
|
|
* Some other elements easily derived from these are
|
|
*
|
|
* Mean Anomolay, M = Lon - Peri
|
|
* Argument of Perihelion, ω = Peri - Node
|
|
*
|
|
* @param {Number|Object} [lon] - mean longitude, L
|
|
* @param {Number} [axis] - semimajor axis, a
|
|
* @param {Number} [ecc] - eccentricity, e
|
|
* @param {Number} [inc] - inclination, i
|
|
* @param {Number} [node] - longitude of ascending node, Ω
|
|
* @param {Number} [peri] - longitude of perihelion, ϖ (Meeus likes π better)
|
|
*/
|
|
function Elements (lon, axis, ecc, inc, node, peri) {
|
|
const o = (typeof lon === 'object' ? lon : {});
|
|
this.lon = o.lon || lon;
|
|
this.axis = o.axis || axis;
|
|
this.ecc = o.ecc || ecc;
|
|
this.inc = o.inc || inc;
|
|
this.node = o.node || node;
|
|
this.peri = o.peri || peri;
|
|
}
|
|
|
|
/**
|
|
* Table 31.A, p. 212
|
|
*/
|
|
const cMean = {
|
|
mercury: { // Mercury
|
|
L: [252.250906, 149474.0722491, 0.0003035, 0.000000018],
|
|
a: [0.38709831],
|
|
e: [0.20563175, 0.000020407, -0.0000000283, -0.00000000018],
|
|
i: [7.004986, 0.0018215, -0.0000181, 0.000000056],
|
|
Ω: [48.330893, 1.1861883, 0.00017542, 0.000000215],
|
|
ϖ: [77.456119, 1.5564776, 0.00029544, 0.000000009]
|
|
},
|
|
venus: { // Venus
|
|
L: [181.979801, 58519.2130302, 0.00031014, 0.000000015],
|
|
a: [0.72332982],
|
|
e: [0.00677192, -0.000047765, 0.0000000981, 0.00000000046],
|
|
i: [3.394662, 0.0010037, -0.00000088, -0.000000007],
|
|
Ω: [76.67992, 0.9011206, 0.00040618, -0.000000093],
|
|
ϖ: [131.563703, 1.4022288, -0.00107618, -0.000005678]
|
|
},
|
|
earth: { // Earth
|
|
L: [100.466457, 36000.7698278, 0.00030322, 0.00000002],
|
|
a: [1.000001018],
|
|
e: [0.01670863, -0.000042037, -0.0000001267, 0.00000000014],
|
|
i: [0],
|
|
Ω: undefined,
|
|
ϖ: [102.937348, 1.7195366, 0.00045688, -0.000000018]
|
|
},
|
|
mars: { // Mars
|
|
L: [355.433, 19141.6964471, 0.00031052, 0.000000016],
|
|
a: [1.523679342],
|
|
e: [0.09340065, 0.000090484, -0.0000000806, -0.00000000025],
|
|
i: [1.849726, -0.0006011, 0.00001276, -0.000000007],
|
|
Ω: [49.558093, 0.7720959, 0.00001557, 0.000002267],
|
|
ϖ: [336.060234, 1.8410449, 0.00013477, 0.000000536]
|
|
},
|
|
jupiter: { // Jupiter
|
|
L: [34.351519, 3036.3027748, 0.0002233, 0.000000037],
|
|
a: [5.202603209, 0.0000001913],
|
|
e: [0.04849793, 0.000163225, -0.0000004714, -0.00000000201],
|
|
i: [1.303267, -0.0054965, 0.00000466, -0.000000002],
|
|
Ω: [100.464407, 1.0209774, 0.00040315, 0.000000404],
|
|
ϖ: [14.331207, 1.6126352, 0.00103042, -0.000004464]
|
|
},
|
|
saturn: { // Saturn
|
|
L: [50.077444, 1223.5110686, 0.00051908, -0.00000003],
|
|
a: [9.554909192, -0.0000021390, 0.000000004],
|
|
e: [0.05554814, -0.000346641, -0.0000006436, 0.0000000034],
|
|
i: [2.488879, -0.0037362, -0.00001519, 0.000000087],
|
|
Ω: [113.665503, 0.877088, -0.00012176, -0.000002249],
|
|
ϖ: [93.057237, 1.9637613, 0.00083753, 0.000004928]
|
|
},
|
|
uranus: { // Uranus
|
|
L: [314.055005, 429.8640561, 0.0003039, 0.000000026],
|
|
a: [19.218446062, -0.0000000372, 0.00000000098],
|
|
e: [0.04638122, -0.000027293, 0.0000000789, 0.00000000024],
|
|
i: [0.773197, 0.0007744, 0.00003749, -0.000000092],
|
|
Ω: [74.005957, 0.5211278, 0.00133947, 0.000018484],
|
|
ϖ: [173.005291, 1.486379, 0.00021406, 0.000000434]
|
|
},
|
|
neptune: { // Neptune
|
|
L: [304.348665, 219.8833092, 0.00030882, 0.000000018],
|
|
a: [30.110386869, -0.0000001663, 0.00000000069],
|
|
e: [0.00945575, 0.000006033, 0, -0.00000000005],
|
|
i: [1.769953, -0.0093082, -0.00000708, 0.000000027],
|
|
Ω: [131.784057, 1.1022039, 0.00025952, -0.000000637],
|
|
ϖ: [48.120276, 1.4262957, 0.00038434, 0.00000002]
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Mean returns mean orbital elements for a planet
|
|
*
|
|
* Argument p must be a planet const as defined above, argument e is
|
|
* a result parameter. A valid non-undefined pointer to an Elements struct
|
|
* must be passed in.
|
|
*
|
|
* Results are referenced to mean dynamical ecliptic and equinox of date.
|
|
*
|
|
* Semimajor axis is in AU, angular elements are in radians.
|
|
*/
|
|
function mean (p, jde, e) {
|
|
const T = base["default"].J2000Century(jde);
|
|
const c = cMean[p];
|
|
e = e || new Elements();
|
|
e.lon = base["default"].pmod(base["default"].horner(T, c.L) * Math.PI / 180, 2 * Math.PI);
|
|
e.axis = base["default"].horner(T, c.a);
|
|
e.ecc = base["default"].horner(T, c.e);
|
|
e.inc = base["default"].horner(T, c.i) * Math.PI / 180;
|
|
e.node = base["default"].horner(T, c.Ω) * Math.PI / 180;
|
|
e.peri = base["default"].horner(T, c.ϖ) * Math.PI / 180;
|
|
return e
|
|
}
|
|
|
|
/**
|
|
* Inc returns mean inclination for a planet at a date.
|
|
*
|
|
* Result is the same as the Inc field returned by function Mean. That is,
|
|
* radians, referenced to mean dynamical ecliptic and equinox of date.
|
|
*/
|
|
function inc (p, jde) { // (p int, jde float64) float64
|
|
return base["default"].horner(base["default"].J2000Century(jde), cMean[p].i) * Math.PI / 180
|
|
}
|
|
|
|
/**
|
|
* Node returns mean longitude of ascending node for a planet at a date.
|
|
*
|
|
* Result is the same as the Node field returned by function Mean. That is,
|
|
* radians, referenced to mean dynamical ecliptic and equinox of date.
|
|
*/
|
|
function node (p, jde) { // (p int, jde float64) float64
|
|
return base["default"].horner(base["default"].J2000Century(jde), cMean[p].Ω) * Math.PI / 180
|
|
}
|
|
|
|
var planetelements = {
|
|
mercury,
|
|
venus,
|
|
earth,
|
|
mars,
|
|
jupiter,
|
|
saturn,
|
|
uranus,
|
|
neptune,
|
|
Elements,
|
|
mean,
|
|
inc,
|
|
node
|
|
};
|
|
|
|
exports.Elements = Elements;
|
|
exports["default"] = planetelements;
|
|
exports.earth = earth;
|
|
exports.inc = inc;
|
|
exports.jupiter = jupiter;
|
|
exports.mars = mars;
|
|
exports.mean = mean;
|
|
exports.mercury = mercury;
|
|
exports.neptune = neptune;
|
|
exports.node = node;
|
|
exports.saturn = saturn;
|
|
exports.uranus = uranus;
|
|
exports.venus = venus;
|