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Old 01-06-2017, 09:42 PM
Francis Vaughan Francis Vaughan is offline
Join Date: Sep 2009
Location: Adelaide, Australia
Posts: 4,734
The Galilean moons might be an interesting question. They are just on the edge of visibility from the Earth. There is a lovely story from some decades ago of an amateur astronomer showing his little daughter a view of Jupiter with his telescope. She exclaimed - "But Daddy, they are the wrong way up!" After some confusion, it became apparent that she could actually see the moons with no optical assistance. It isn't that the moons are too dim - but that the angular separation from Jupiter is too little to avoid Jupiter's brightness making it too hard to separate. Very acute sight with very good atmospheric seeing could reasonably account for the little girl's capability. With no meaningful atmosphere on Mars the seeing will be very stable and clear. This might be enough to make seeing the moons a reasonable thing.

Jupiter's disk however will remain unresolved. It will still be a point.

Last edited by Francis Vaughan; 01-06-2017 at 09:42 PM.