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85 Io ( ) is a large, dark main-belt asteroid of the C spectral class. It is probably a primitive body composed of carbonates. Like 70 Panopaea it orbits within the Eunomia asteroid family but it is not related to the shattered parent body. Io is a retrograde rotator, with its pole pointing towards one of ecliptic coordinates (β, λ) = (-45°, 105°) or (-15°, 295°) with a 10° uncertainty.〔 This gives an axial tilt of about 125° or 115°, respectively. Its shape is quite regular. It was discovered by C. H. F. Peters on September 19, 1865, and named after Io, a lover of Zeus in Greek mythology. An Ionian diameter of 178 kilometres was measured from an occultation of a star on December 10, 1995.〔 Another asteroid occultation of Io (magnitude 13.2) occurred on March 12, 2009, from the eastern USA, with the star 2UCAC 35694429 (magnitude 13.8).〔http://www.asteroidoccultation.com/2009_03/0312_85_20455.htm 〕 Io is also the name of the volcanic satellite of Jupiter. With a two-digit number and a two-letter name, 85 Io has the shortest designation of all minor planets. == 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「85 Io」の詳細全文を読む スポンサード リンク
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