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Phobos is the innermost and larger of the two natural satellites of Mars, the other being Deimos. The two moons were discovered in 1877 by American astronomer Asaph Hall.
Phobos is a small, irregularly shaped object with a mean radius of 11 km (7 mi). Phobos orbits 6,000 km (3,700 mi) from the Martian surface, closer to its primary body than any other known planetary moon. It orbits Mars much faster than Mars rotates and completes an orbit in just 7 hours and 39 minutes. Images and models indicate that Phobos may be a rubble pile held together by a thin crust that is being torn apart by tidal interactions.
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