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I've been perusing through some information about Saturns' co-orbital moons, Epimetheus and Janus, recently. Fascinating stuff there .. and they've learned so much more from Cassini data, like about the 'propeller' features in the ring material caused by shepherd moon resonance and the impact effects on the surface features, and the clouds of ejecta. Different influences and complexities, (I guess) when compared with Asteroids, but also similar in other ways.
They also seem to trying to work out the internal density distribution from spin/eccentricities.
Oh well .. its all very interesting.
Cheers
PS: Epimetheus' mean density is only 0.69 ± 0.11 g/cm³, Janus' is 0.64 ± 0.06 g/cm³ (note the small error terms !), which I think, together with surface Albedo measurements result in the conclusion that they are very porous ! …. cheers
Last edited by CraigS; 16-09-2010 at 12:34 PM.
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