Viking
2 Orbiter image of Phobos orbiting over Ascraeus Mons on Mars. Phobos
is about 8000 km below the spacecraft and 22 km across. Ascraeus
Mons is 13,000 km away and about 300 km at its base, centered at
11 N, 104 W. North is at 11:30, and Phobos is moving from left to
right relative to the surface.
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