Bonfire: Map the Debris

bonfire-map-the-debris.js

// Bonfire: Map the Debris
// Author: @clive-bunting
// Challenge: http://www.freecodecamp.com/challenges/bonfire-map-the-debris
// Learn to Code at Free Code Camp (www.freecodecamp.com)

function orbitalPeriod(arr) {
  var GM = 398600.4418;
  var earthRadius = 6367.4447;
  var results = [];
  for(var i = 0; i < arr.length; i++) {
    var semiMajorAxis = earthRadius + arr[i].avgAlt;
    var T = Math.round( 2.0 * Math.PI * Math.sqrt( Math.pow(semiMajorAxis, 3) / GM ));
    results.push({name: arr[i].name, orbitalPeriod: T});
  }
  return results;
}

orbitalPeriod([{name : "sputnik", avgAlt : 35873.5553}]);