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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク 2867 Šteins ： ウィキペディア英語版 2867 Šteins 2867 Šteins is a small main-belt asteroid that was discovered in 1969 by Nikolai Chernykh.〔 It is named after Kārlis Šteins, a Latvian and Soviet astronomer.〔 Šteins was visited by the European Space Agency's Rosetta space probe in 2008. == Physical characteristics == A study published in 2006 by astronomers at the European Southern Observatory showed that Šteins is an E-type asteroid with a diameter of approximately 4.6 km.〔 Studying the asteroid before its flyby, the ESA Rosetta space probe showed via a lightcurve analysis that Šteins has a rotation period of about six hours, is irregular in shape, and does not have any moons.〔 After the Rosetta flyby, the ESA described Šteins as 'a diamond in the sky', as it has a wide body that tapers into a point. The wide section is dominated by a large crater (2.1 km diameter), which surprised scientists, who were at first amazed the asteroid survived such an impact,〔 while later it turned out that the ratio of crater diameter $D$ to asteroid size $R$ is with a value of $D/R\; =\; 0.79$ in fact not abnormaly large.〔 The photographs of Šteins taken by Rosetta allowed scientists to determine that the asteroid has dimensions of 6.67 × 5.81 × 4.47 km,〔 which equates to a mean diameter of 5.3 km.〔 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「2867 Šteins」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.