1 const binaryStarNames = {
  2     etaCor: "eta-Cor",
  3     gammaVir: "gamma-Vir",
  4     etaCas: "eta-Cas",
  5     zetaOri: "zeta-Ori",
  6     alphaCma: "alpha-CMa",
  7     deltaGem: "delta-Gem",
  8     alphaGem: "alpha-Gem",
  9     aplahCmi: "aplah-CMi",
 10     alphaCen: "alpha-Cen",
 11     alphaSco: "alpha Sco"
 12 };
 13 
 14 /**
 15  * Binary Star Data
 16  * 
 17  * Elements:
 18  *   0: binaryName -- Name of binary system.
 19  *   1: period     -- Period of the orbit.
 20  *   2: epochPeri  -- Epoch of the perihelion.
 21  *   3: longPeri   -- Longitude of the perihelion.
 22  *   4: ecc        -- Eccentricity of the orbit.
 23  *   5: axis       -- Semi-major axis of the orbit.
 24  *   6: incl       -- Orbital inclination.
 25  *   7: paNode     -- Position angle of the ascending node.
 26  */
 27 const binaryData = [
 28     [binaryStarNames.etaCor, 41.623, 1934.008, 219.907, 0.2763, 0.907, 59.025, 23.717],
 29     [binaryStarNames.gammaVir, 171.37, 1836.433, 252.88, 0.8808, 3.746, 146.05, 31.78],
 30     [binaryStarNames.etaCas, 480.0, 1889.6, 268.59, 0.497, 11.9939, 34.76, 278.42],
 31     [binaryStarNames.zetaOri, 1508.6, 2070.6, 47.3, 0.07, 2.728, 72.0, 155.5],
 32     [binaryStarNames.alphaCma, 50.09, 1894.13, 147.27, 0.5923, 7.5, 136.53, 44.57],
 33     [binaryStarNames.deltaGem, 1200.0, 1437.0, 57.19, 0.11, 6.9753, 63.28, 18.38],
 34     [binaryStarNames.alphaGem, 420.07, 1965.3, 261.43, 0.33, 6.295, 115.94, 40.47],
 35     [binaryStarNames.aplahCmi, 40.65, 1927.6, 269.8, 0.4, 4.548, 35.7, 284.3],
 36     [binaryStarNames.alphaCen, 79.92, 1955.56, 231.56, 0.516, 17.583, 79.24, 204.868],
 37     [binaryStarNames.alphaSco, 900.0, 1889.0, 0.0, 0.0, 3.21, 86.3, 273.0]
 38 ];
 39 
 40 function getBinaryData(binaryName) {
 41     let [binary_name, period, epochPeri, longPeri, ecc, axis, incl, paNode] = ["not found", -99, -99, -99, -99, -99, -99, -99];
 42 
 43     for (let iLoop = 0; iLoop < binaryData.length; iLoop++) {
 44         if (binaryData[iLoop][0] == binaryName) {
 45             binary_name = String(binaryData[iLoop][0]);
 46             period = Number(binaryData[iLoop][1]);
 47             epochPeri = Number(binaryData[iLoop][2]);
 48             longPeri = Number(binaryData[iLoop][3]);
 49             ecc = Number(binaryData[iLoop][4]);
 50             axis = Number(binaryData[iLoop][5]);
 51             incl = Number(binaryData[iLoop][6]);
 52             paNode = Number(binaryData[iLoop][7]);
 53 
 54             break;
 55         }
 56     }
 57 
 58     return [binary_name, period, epochPeri, longPeri, ecc, axis, incl, paNode];
 59 };
 60 
 61 
 62 module.exports = {
 63     binaryStarNames,
 64     binaryData,
 65     getBinaryData
 66 }