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Originally Posted by Fram
I guess that apart from a stable orbit aruond a planet, it also has to 'fly' on its own, not in a larger group in approximately the same orbit. Thus you exclude rings. As for minimum size, that's harder to decide...
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Interesting, as I understand it a few of Saturn's and Jupiter's moons are co-orbital.
http://www.solarviews.com/eng/janus.htm
Take Janus and Epimethius for example.