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Homework Help: Newtons theory of gravity : satelite orbits and ellipses

  1. Nov 12, 2009 #1
    The figure shows two planets of mass m orbiting a star of mass M. The planets are in the same orbit, with radius r, but are always at opposite ends of a diameter.
    This is the equation eq. I used:


    This is what I came up with but it is not the right answer. Where did I go wrong?


    Any help would be great!
  2. jcsd
  3. Nov 12, 2009 #2

    What are you trying to find ?
  4. Nov 12, 2009 #3


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    What figure?

  5. Nov 12, 2009 #4
    I'm sorry. I'm trying to find T the orbital period
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