23463.2 km (6.92 Mars radii)
Average orbital speed
6.2 ± 0.18
Average surface temperature
≈ 233 K
12.45 ± 0.05
moon of the planet Mars that orbits farther out than Mars's larger moon, Phobos.
It is predicted that Deimos, like
Phobos, is an asteroid captured from the Asteroid Belt. This is plausible due to its size and shape.
Named Geoligical Features Edit
Only two geological features on Deimos have been given names. The craters Swift and Voltaire are named after writers who speculated on the existence of two Martian moons before Phobos and Deimos were discovered.
Swift and Voltaire
Asaph Hall discovered it on August 12, 1877.
It orbits Mars every 30.35 days.