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1207 Ostenia, provisional designation 1931 VT, is a stony asteroid from the outer region of the asteroid belt, about 23 kilometers in diameter. It was discovered by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany on 15 November 1931.〔 The S-type asteroid is a member of the Eos family, thought to have formed from a catastrophic collision of its parent body resulting in more than 4,000 known members of the family. It orbits the Sun at a distance of 2.8–3.3 AU once every 5 years and 3 months (1,919 days). Its orbit shows an eccentricity of 0.09 and is tilted by 10 degrees to the plane of the ecliptic. It has an albedo of 0.13–0.18, according to the space-based surveys carried out by the Infrared Astronomical Satellite, IRAS, and the Wide-field Infrared Survey Explorer missions.〔〔 Photometric observations of the asteroid during 2006 at the Palmer Divide Observatory in Colorado Springs, Colorado ''(see )'', were used to generate a light-curve with a period of hours and a variation in brightness of magnitude.〔 Subsequent measurements in 2009 and 2011 confirmed the rotation period to be 9.07 hours〔〔 while two older observations made in the 1970s gave significant shorter periods of and hours, respectively.〔〔 The minor planet was named after Hans Osten (1875–1936) a German amateur astronomer, orbit computer and business man.〔 As a non-professional, Osten attracted attention with his precises calculations of comets and asteroids. He is known for calculating the orbit of 447 Valentine, taking into account perturbations by all major planets with such precision, that it was considered exemplary in the astronomical community. Osten received the silver Leibniz Medal in 1911.〔 == 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「1207 Ostenia」の詳細全文を読む スポンサード リンク
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