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Homework Help: Semimajor axis

  1. May 14, 2010 #1
    my question is.......... the semimajor axis of the orbit of jupiter is 7.8*108.
    If an asteroid has an orbital period half of that of jupiter what is the semi major axis?

    All i did was times 7.8*108 by 1/2 and got 3.9*108.

    Seems to simple!!??

    any comments much appreciated
  2. jcsd
  3. May 14, 2010 #2


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    Homework Helper

    Look up Kepler's third law.
  4. May 14, 2010 #3

    D H

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    Staff Emeritus
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    Thread closed. Don't cross-post, ghostbuster25.
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