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orbit: 23,459 km from Mars diameter: 12.6 km (15 x 12.2 x 11) mass: 1.8e15 kg
Discovered 1877 August 10 by Hall, photographed by Viking 1 in 1977.
Deimos and Phobos are composed of carbon-rich
rock like C-type asteroids and ice.
Both are heavily cratered.
Deimos and Phobos are probably asteroids perturbed by Jupiter into orbits that allowed them to be captured by Mars.