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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.
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 is named after the Greek god of fear and panic, who is the son of Ares (Mars) and twin brother of Deimos. Phobos is a small, irregularly shaped object with a mean radius of 11 km (7 mi). It orbits 6,000 km (3,700 mi) from the Martian surface, closer to its primary body than any other known natural satellite to a planet.
And circled in the midst of all was the blank-eyed face of the Gorgo (Gorgon) with her stare of horror, and Deimos (Dread) was inscribed upon it, and Phobos (Fear). Homer, Iliad 15. 119 ff:"So he [Ares] spoke, and ordered Deimos (Dread) and Phobos (Fear) to harness his horses, and himself got into his shining armour."
The poet Antimachus, in a misrepresentation of Homer's account, portrays Deimos and Phobos as the horses of Ares. [7] In Nonnus' Dionysiaca, Zeus arms Phobos with lightning and Deimos with thunder to frighten Typhon. [8] Later in the work, Phobos and Deimos act as Ares' charioteers to battle Dionysus during his war against the Indians. [9]
The moons of Mars: Phobos and Deimos. Phobos is the larger of the two moons, and is the closer of the two to Mars. Phobos has an average radius of 11 km, while Deimos has an average radius of 6 km. The origin of Mars' moons, Phobos and Deimos (pictured right), is unknown and remains controversial. One theory is that the moons are captured ...
Phobos AND DeimOs Retroreflector Array (PANDORA) is a compact passive laser retroreflector device on the PADME spacecraft that would be used as a laser ranging time-of-flight target for a laser communication system on Mars (possibly on board NASA's Mars 2020 rover) to conduct technology demonstrations of laser communication through the martian ...
Phobos: Mars I: 1877: Hall named his two newly discovered satellites of Mars Phobus and Deimus: Astronomische Nachrichten, Vol. 92, No. 2187, pp. 47/48 14 March 1878 (signed 7 February 1878). The names were subsequently amended to Phobos and Deimos. Deimos: Mars II 1880: Camille Flammarion: Triton: Neptune I: 1846