![]() Phobos is one of the least reflective bodies in the Solar System, with an albedo of 0.071. As a result, from the surface of Mars it appears to rise in the west, move across the sky in 4 hours and 15 minutes or less, and set in the east, twice each Martian day. ![]() It orbits Mars much faster than Mars rotates and completes an orbit in just 7 hours and 39 minutes. Phobos orbits 6,000 km (3,700 mi) from the Martian surface, closer to its primary body than any other known planetary moon. Phobos is a small, irregularly shaped object with a mean radius of 11 km (7 mi). It is named after Phobos, the Greek god of fear and panic, who is the son of Ares (Mars) and twin brother of Deimos. The two moons were discovered in 1877 by American astronomer Asaph Hall. ![]() Phobos ( / ˈ f oʊ b ɒ s/ systematic designation: Mars I) is the innermost and larger of the two natural satellites of Mars, the other being Deimos. ![]()
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