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Homework Help: Halley's comet eccentricity

  1. Oct 16, 2009 #1
    1. The problem statement, all variables and given/known data
    I am given Rp=.6AU and need to find the eccentricity.

    2. Relevant equations

    3. The attempt at a solution
    I can find what Halley's comet eccentricity is (0.967) but I need to actually calculate it. What is the equation I need? I know I need to know Ra, or a, or p.
  2. jcsd
  3. Oct 16, 2009 #2


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    Are you told the period of Haley's orbit?
  4. Oct 16, 2009 #3
    yes, I guess I was and overlooked it. It was stated in 1910-1986, so 76 years. I can now find a and solve the problem. Thanks!
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