Deimos Mars II Deimos ( DEE mos ) is the smaller and outermost of Mars' two moons. It is the smallest known moon in the solar system. orbit: 23, 459 km from Mars diameter: 12.6 km (15 x 12.2 x 11) mass: 1.8e15 kg In Greek mythology, Deimos is one of the sons of Ares (Mars) and Aphrodite (Venus); deimos is Greek for panic . Discovered 1877 August 10 by Hall, photographed by Viking 1 in 1977.

Deimos Video: Deimos Rotation Movie - High Quality ...