What is the reason for my code to not work on the Map the Debris challenge?

Tell us what’s happening:
I am trying to figure out why I can’t pass the challenge with my solution. I feel like my solution does everything correctly. Can anyone point out what I am doing wrong here? Thanks!

Your code so far


function orbitalPeriod(arr) {
  var GM = 398600.4418;
  var earthRadius = 6367.4447;
  
  var orbital = 2 * Math.PI * Math.sqrt(earthRadius + (Math.pow(arr.avgAlt, 3)/GM));

  arr.pop();

  arr.push({oribtalPeriod: orbital});

  return arr;
}

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

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.87 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/map-the-debris