Orbital period formula?

What formula are we supposed to use to find the orbital period for this? I don’t get that.

Your code so far

function orbitalPeriod(arr) {
let GM = 398600.4418;
let earthRadius = 6367.4447;
return arr;

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

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.89 Safari/537.36 Edg/84.0.522.40.

Challenge: Map the Debris

Link to the challenge:

1 Like

You should use the formula in the linked Wikipedia article under the section Two Bodies Orbiting Each Other.

I had to look at the solution provided by the site so I could see how to properly use the formula. But I got it.

Why is the section that says – “The formula needed is:” – just empty?

** EDIT **
For anyone who sucks at math and just needs the formula and stumbles upon this post!

let a = 2 * Math.PI;
let c = Math.pow(earthRadius + obj.avgAlt, 3);
let b = Math.sqrt(c / GM);
let orbPeriod = Math.round(a * b);
1 Like

Thanks for letting me know about the broken image. I’ve updated the guide.

1 Like

Nice! Thanks man and sorry for not blurring that out :frowning:

So I wasn’t misunderstanding. There really was a problem with the image in that guide.

Thanks for the fix.

1 Like