Thank you for the response!
My problem was that I hadn't taken into account the radius of the earth. (I also typed the formula above incorrectly.)
Interestingly enough, this was a homework problem for my Astrodynamics class.
I should have phrased that better; I meant that the distances are usually in AU, not the period.
I'm not sure if I understand what you mean by "what happened to the earth"...the Earth's mass is taken into account in Mu which is G*M where G is the gravitational constant, and M is the mass of...
Homework Statement
An Earth satellite is observed to have a height of perigee of 100 n mi and a height of apogee of 600 n mi. Find the period of the orbit.
Homework Equations
(1) Period = (2*pi/sqrt(mu)) * A^(2/3)
(2) rp+ra = 2A
Where:
Mu is the Standard Gravitational Parameter...