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Homework Help: Planetary motiom

  1. Oct 25, 2008 #1
    1. The problem statement, all variables and given/known data
    a 9.9*10^23 kg planet orbits a star in a circular orbit. The planet is 5.6 AU away from the star and has an orbital velocity of 32 km/s. What is the mass of the star. (1AU = 1.496*10^11m)

    2. Relevant equations
    G Mp Ms / r^2 = Mp V^2/r

    3. The attempt at a solution
    Ms = v^2 r /G
    is my solution correct
  2. jcsd
  3. Oct 25, 2008 #2


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    Staff Emeritus
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    Gold Member

    Looks good to me.
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