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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 1999 Hirayama ： ウィキペディア英語版 1999 Hirayama 1999 Hirayama, provisional designation 1973 DR, is an asteroid from the main-belt that was discovered by Czech astronomer Luboš Kohoutek at Bergedorf Observatory in Hamburg on 27 February 1973.〔 The asteroid measures about 34 kilometers in diameter and orbits the Sun at a distance of 2.8–3.5 AU once every five and a half years. Its geometric albedo of 0.09 has been measured by the Infrared Astronomical Satellite, IRAS.〔 The light curve of 1999 Hirayama shows a periodicity of hours, during which time the brightness of the object varies by in magnitude.〔 The spectrum of this object matches a C-type Tholen classification, but with a "broad absorption band that can be associated to a process of aqueous alteration".〔 That is, the surface appears to show some form of water modification. It is named after Japanese astronomer Kiyotsugu Hirayama (1874–1943), best known for his discovery that many asteroid orbits were more similar to one another than chance would allow, leading to the concept of asteroid families, now called Hirayama families. The lunar carter ''Hirayama'' is also named in his honour.〔 == 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「1999 Hirayama」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.