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h〔 h〔 h〔 | albedo = 0.22 〔 〔 〔 | spectral_type = B–V = 0.790 U–B = 0.442 S , S S 〔 | abs_magnitude = 16.84 }} 1865 Cerberus, provisional designation 1971 UA, is a stony asteroid, classified as a near-Earth object, about 1.6 kilometers in diameter. It was discovered on 26 October 1971 by Czech astronomer Luboš Kohoutek at the Hamburger Bergedorf Observatory in Germany and named in 1974.〔 The S-type asteroid orbits the Sun at a distance of 0.6–1.6 AU once every 1.12 years (410 days). It has a rotation period of 6.804 hours and a geometric albedo of 0.220. Cerberus is composed of 65% plagioclase and 35% pyroxene,〔 and passes within 30 gigametres (Gm) of the Earth 7 times from the year 1900 to the year 2100, each time at a distance of 24.4 Gm to 25.7 Gm. It also makes close approaches to Mars and Venus. The asteroid is named after the figure from Greek mythology, Cerberus, a three-headed dog that guarded the entrance to Hades, the Underworld. His capture marked the last of the twelve labors of Hercules. It is also the name of an extinct constellation, ''Cerberus'', now contained in the eastern part of Hercules.〔 It should not be confused with Kerberos, a moon of the dwarf planet Pluto. == References == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「1865 Cerberus」の詳細全文を読む スポンサード リンク
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