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Planet name

  1. Jul 6, 2008 #1
    Why most extrasolar planet names start with the letters HD
  2. jcsd
  3. Jul 6, 2008 #2


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    I believe they are named for the stars that they orbit. HD is a common star name because it appears listed in the Henry Draper star catalog. Hence you see names like HD ####### followed by lowercase letter designating which planet out with "a" being the closest in planet.

    This is my understanding anyway.
  4. Jul 6, 2008 #3
    thank you
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