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Deimos is the smaller and outermost of the two natural satellites of Mars, the other being Phobos. Deimos has a mean radius of 6.2 km (3.9 mi) and takes 30.3 hours to orbit Mars.[5] Deimos is 23,460 km (14,580 mi) from Mars, much farther than Mars' other moon, Phobos. The largest crater on Deimos is approximately 2.3 km in diameter, 1/5 the size of the largest crater on Phobos. Although both moons are heavily cratered, Deimos has a smoother appearance caused by the partial filling of some of its craters.
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