'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;