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Deimos (moon)
Deimos (systematic designation: Mars II)〔 is the smaller and outer of the two natural satellites of the planet Mars with a mean radius of ,〔 the other being Phobos. Deimos takes 30.3 hours〔 to orbit Mars. The name ''Deimos'' is pronounced , or sometimes or like the Greek . In Greek mythology, Deimos was the twin brother of Phobos and personified terror.
==Discovery==
(詳細はAsaph Hall, Sr. at the United States Naval Observatory in Washington, D.C on 12 August 1877, at about 07:48 UTC (given in contemporary sources as "11 August 14:40" Washington mean time, using an astronomical convention of beginning a day at noon, so 12 hours must be added to get the actual local mean time).〔Hall, A.; (''Observations of the Satellites of Mars'' ), Astronomische Nachrichten, Vol. 91, No. 2161 (17 October 1877, signed 21 September 1877) pp. 11/12–13/14〕〔Morley, T. A.; (''A Catalogue of Ground-Based Astrometric Observations of the Martian Satellites, 1877–1982'' ), Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), Vol. 77, No. 2 (February 1989), pp. 209–226 (Table II, p. 220: first observation of Deimos on 1877-08-12.32526)〕〔(''Notes: The Satellites of Mars'' ), The Observatory, Vol. 1, No. 6 (20 September 1877), pp. 181–185〕〔(''The Discovery of the Satellites of Mars'' ), Monthly Notices of the Royal Astronomical Society, Vol. 38, No. 4, (8 February 1878), pp. 205–209〕 Hall also discovered Phobos on 18 August 1877, at about 09:14 GMT, after deliberately searching for Martian moons.
It is named after Deimos, a figure representing dread in Greek Mythology. The names, at first spelled ''Phobus'' and ''Deimus'', were suggested by Henry Madan (1838–1901),〔 Science Master of Eton, from Book XV of the ''Iliad'', where Ares (the Roman god Mars) summons Dread (Deimos) and Fear (Phobos).〔Hall, A.; (''Names of the Satellites of Mars'' ), Astronomische Nachrichten, Vol. 92, No. 2187 (14 March 1878, signed 7 February 1878), p. 47/48〕
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