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Deimos is one of the two moons that orbit the planet Mars. It is smaller and more distant from Mars than its companion moon Phobos, making it a less prominent feature in the Martian sky.
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Deimos (/ˈdaɪməs/) is the smaller and outer 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. Deimos is 23,460 km (14,580 mi) from Mars, much farther than Mars's other moon, Phobos. It is named after Deimos, the Ancient Greek god and personification of dread and terror.
Discovery and etymology