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What kind of self-respecting planet has a moon 1/2 its diameter?



 
 
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Old July 21st 15, 09:49 AM posted to sci.astro.amateur
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Default What kind of self-respecting planet has a moon 1/2 its diameter?

On Monday, July 20, 2015 at 4:33:06 PM UTC-4, Chris L Peterson wrote:
On Mon, 20 Jul 2015 11:41:02 -0700 (PDT), wsnell01 wrote:

Are the following your words or those of the professional astronomical cummunity?:

" Charon is not in orbit around Pluto, but around the Sun. The two
bodies have a barycenter outside of both. By some provisional
definitions, and certainly by some definitions in informal use, both
are planets, and as such would be considered a binary planetary
system."


This is the view of the professional community.


You didn't answer the question. Are those your words, yes or no?

" This is similar to the Earth-Moon system. The Moon isn't in orbit
around the Earth, and it is spherical. So it could be considered to
have planet status. But as long as the Earth-Moon barycenter remains
inside the Earth, the Moon is likely to remain categorized as a moon.
In a few billion years, the barycenter will be above Earth's surface,
and this system might be treated as a binary planet. Not that there's
likely to be any intelligent species around to make that judgment."


This is the view of the professional community.


You didn't answer the question. Are those your words, yes or no?

 




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