**Tell us what’s happening:**

Got 1 /2 checked, can’t seem to iterate to more keys.

Am I even going the right direction with this code?

I Hope, someone could help. It will be a great help.

Cheers~~

**Your code so far**

```
function orbitalPeriod(arr) {
for (let i in arr) {
var a = 6367.4447 + arr[i].avgAlt;
var GM = 398600.4418;
var a_3 = Math.pow(a, 3);
var pi_2 = 2*Math.PI;
var sqrt = Math.sqrt(a_3/GM)
for (let j in arr) {
arr[j].orbitalPeriod = Math.round(pi_2*sqrt);
delete arr[j].avgAlt;
}
return arr;
}
};
console.log(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/80.0.3987.149 Safari/537.36`

.

**Challenge:** Map the Debris

**Link to the challenge:**