Auros (auros) wrote,
Auros
auros

  • Mood:

Sedna a planet? I think not.

Check out the orbit.

I think the best definition I've seen for planets is the one provided by the folks at CalTech who took part in discovering Sedna: "We define a planet to be any body in the solar system that is more massive than the total mass of all of the other bodies in a similar orbit. For example, many asteroids cross the orbit of the earth. Yet the earth is more massive than all of those put together. Thus, the earth is a planet. Ceres, the largest asteroid, is not greater in mass than the sum of the masses of the remaining asteroids. Hence, not a planet."

Sedna almost certainly doesn't meet this criterion.

And I still think Cruithne is a lot cooler. (See also: Paul Wiegert's page about Cruithne. Scroll to the bottom and check out the movie of its orbit.)
Subscribe
  • Post a new comment

    Error

    Anonymous comments are disabled in this journal

    default userpic

    Your reply will be screened

    Your IP address will be recorded 

  • 14 comments