Phobos: Martian moon Phobos over Ascraeus Mons phobosmars_viking2
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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Image Credit: NASA