Determine the orbital period of Phobos

[Alexanddros81]

Homework Statement

14.101 The orbit of Phobos, a Martian moon, has an eccentricity of 0.018 and a
major semiaxis of length 9380 km. Determine the orbital period of Phobos

Homework Equations

The Attempt at a Solution

Can you check my solution?

 

[gneill]

THe value that you've used for the mass of Mars looks a little high to me. Maybe some digits out of order?