posted on Aug, 13 2012 @ 02:11 PM
I'll wager that one of them is Phobos. it moves quickly around Mars
in less than 8 hours at about 5970 Km above the surface of Mars.
If anyone knows the orientation of the rover, they could give us a fairly good estimate of which, if either, body is Phobos.
To really nail down the alternative possibilities, we would need to know all of the satellites in that orientation around Mars in low orbits. The one
that moves horizontally follows the horizon closely. From the rover's surface perespective, that object cannot be tens of thousands of miles high,
as some if not most of those satellites are not in very circular orbits. I would say that it, if either one, is Phobos.