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Rev 149 - May 30-Jun 29, 2011 - Helene, Distant Iapetus, mutual events
Phil Stooke
post Jul 4 2011, 10:56 AM
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Very nice. I think that other face is the leading side as you say.


... because the Solar System ain't gonna map itself.
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post Feb 20 2017, 06:26 AM
Post #77


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Just "discovered" Helene, what a peculiar-looking moon! Any idea what its surface gravity would be?

Here's my RGB composite from N00172891, N00172892, and N001728913

Attached Image

Enhanced saturation:
Attached Image

A lot of work went into "massaging" the individual images into alignment, but there's still some colour fringing.

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post Feb 21 2017, 04:19 AM
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007 m/s2 from Wolfram Alpha: http://www.wolframalpha.com/input/?i=helene+surface+gravity
The equation is pretty simple to calculate oneself, though: g = G * M / r2.
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