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Thread: planetary motion

  1. November 24th 2008, 04:54 PM #1
    su-z-q
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    Question planetary motion

    A planet orbits a star with mass 4.35e+30 kg. The semimajor axis of the planet's orbit is 2.94×1012 m. What is the period of the planet's orbit in seconds?
    An extrasolar planet has a small moon, which orbits the planet in 336 hours. The semimajor axis of the moon's orbit is 2.22e+9 m. What is the mass of the planet?
    please help me i'm sooo confused about these problem.
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  2. November 24th 2008, 05:21 PM #2
    skeeter
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    this is just a plug and chug into the formula problem ... where is your difficulty?
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  3. November 25th 2008, 05:40 PM #3
    su-z-q
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    Quote Originally Posted by skeeter View Post
    this is just a plug and chug into the formula problem ... where is your difficulty?
    which formula? i got a whole bunch!
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  4. November 25th 2008, 05:43 PM #4
    skeeter
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    Kepler's law of harmony ...

    T^2 = \frac{4\pi^2}{GM} R^3
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