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:	post by Man_of_the_Century at 2006-08-16 11:06:15

burnsy said:

in my opinion, if charon is gonna be called a planet, then our moon and every moon should be a planet as well. if my memory serves me correctly, charon is pluto's satellite. sucks for the kids who gotta memorize the planets in science class.

This was the logic behind that choice:

"For two or more objects comprising a multiple object system, the primary object is designated a planet if it independently satisfies the conditions above. A secondary object satisfying these conditions is also designated a planet if the system barycentre resides outside the primary. Secondary objects not satisfying these criteria are “satellites”. Under this definition, Pluto’s companion Charon is a planet, making Pluto-Charon a double planet."

If you go to http://www.badastronomy.com there is a good write-up that explains a lot of the reasoning behind this whole shindig. Its in his blog, should be right on the main page.

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