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Compared to the Earth's Moon, the moons Phobos and Deimos are small. Phobos has a diameter of 22.2 km (13.8 mi) and a mass of 1.08 × 10 16 kg, while Deimos measures 12.6 km (7.8 mi) across, with a mass of 1.5 × 10 15 kg.
Unlike Deimos, Phobos is heavily cratered, [30] with one of the craters near the equator having a central peak despite the moon's small size. [31] The most prominent of these is the crater Stickney, a large impact crater some 9 km (5.6 mi) in diameter, which takes up a substantial proportion of the moon's surface area.
Deimos (/ ˈ d aɪ m ə s /; systematic designation: Mars II) [11] 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. [5] Deimos is 23,460 km (14,580 mi) from Mars, much farther than Mars's other moon, Phobos. [12]
Phobos (Ancient Greek: Φόβος, lit. 'flight, fright', [1] pronounced, Latin: Phobus) is the god and personification of fear and panic in Greek mythology. Phobos was the son of Ares and Aphrodite, and the brother of Deimos. He does not have a major role in mythology outside of being his father's attendant. [2]
The moons' small sizes have made them unpopular settings in science fiction, [c] with some exceptions such as the 1955 novel Phobos, the Robot Planet by Paul Capon and the 2001 short story "Romance with Phobic Variations" by Tom Purdom in the case of Phobos, and the 1936 short story "Crystals of Madness" by D. L. James in the case of Deimos ...
Once in Mars orbit, PADME would carry out 16 flybys of Phobos followed by 9 flybys of Deimos. [5] Flybys would take place at two-week intervals. Flyby altitudes at closest approach to Phobos and Deimos would be ~2 km. [5] Following completion of its primary mission, PADME could remain in high Mars orbit for long-term monitoring of the martian system and search for potential additional moonlets ...
Deimos (moon)#Named geological features Topics referred to by the same term This disambiguation page lists articles associated with the title List of features on Phobos and Deimos .
I don't think the precise size of Phobos was known until the sixties. Certainly there were upper limits to their potential size, but Phobos would only have to be three times its actual diameter to appear notably larger than our Moon, because it orbits so close to Mars' surface. RandomCritic 20:03, 28 May 2007 (UTC) Interesting point.