Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

What is the synodic period of Mercury?

  1. Apr 3, 2009 #1
    What is the synodic period of Mercury? What is the average synodic period of Mercury? I have combed the internet. Some sources use a number around

    115.877484 days and they seem sure of themselves.

    I don't own astronomy references. Help please
     
  2. jcsd
  3. Apr 3, 2009 #2

    mgb_phys

    User Avatar
    Science Advisor
    Homework Helper

  4. Apr 3, 2009 #3
    That page just gives

    115.88 days

    and I have a feeling that this is a rounded-off number.
     
  5. Apr 3, 2009 #4

    mgb_phys

    User Avatar
    Science Advisor
    Homework Helper

    You can calculate the synoptic period from the orbital period of mercury and earth
    E = Earth sidereal year
    P = Other planet sidereal year
    Then sp = 1/(1/E-1/P)
     
  6. Apr 3, 2009 #5
    I would calculate this as ( correcting mgb's equation )
    P = 87.9691
    E = 365.256363
    sp = 1/(1/P-1/E) = 115.8772

    However, a lot of internet sources, even encyclopedic ones, have a preference for

    sp = 115.8776 days
     
  7. Apr 3, 2009 #6
    and with possibly better values, I would now calculate this as
    P = 87.96934
    E = 365.256363
    sp = 1/(1/P-1/E) = 115.877623

    and some other references have concurred with this datum
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: What is the synodic period of Mercury?
  1. Venus Synodic Period (Replies: 1)

Loading...