QUOTE (paxdan @ Jun 2 2005, 02:03 PM)
what are the chances that MSL will be able to resolve the moon too?
Difficult to say on this image!!
The Moon shows 13 time less surface than Earth, and its Albedo is 7% against 35% for Earth. This means that it is 65 times less luminous.
On the picture Earth occupies 3-4 pixels large, but I doubt it is its real dimention, rather it is smearing from high exposure or optical imperfections.
So we should expect that the Moon is visible as a 1 pixel spot, white or at least clearer than the background.
More, Oppy is on the equator of Mars, so that the Moon ellipse is expected to be near the vertical. But I have no idea of its size.
The worse difficulty is in fact the JPEG noise of the image. Increasing contrast with a graphic processor makes appear many jpeg spots, but some possible candidates also appear:
Best candidates:
65 pixels at right and 125 pixel above
78 pixels at left and 51 pixels lower.
Lesser candidates (more likely JPEG noise)
8 pixels at left and 26 above
22 pixels at left an 6 under
That makes two candidates, but one or both of them could be a star, or just jpeg noise.
Jpeg images are bad for this kind of sport, as they add much speckles which can be misinterpreted as bright spots, or they can even make disappear a real spot. PNG images are better, and they can be made so what not to take much more download time.
All this makes Earth very bright seen from Mars, much more than many stars!!