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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 335 Roberta ： ウィキペディア英語版 335 Roberta 335 Roberta is a large main belt asteroid. It was discovered by German astronomer Anton Staus on September 1, 1892 in Heidelberg.〔 This was his only asteroid discovery. Photometric observations of this asteroid from multiple sites during 2007 gave a light curve with a period of 12.054 ± 0.003 hours and a brightness variation of 0.13 ± 0.02 in magnitude. This agrees with a result reported in 1992, but differs from period estimates of 8.03 hours and 4.349 reported in 1987 and 2001, respectively.〔 Under the SMASS classification taxonomy, Polana is listed as a B-type asteroid; a group that combines both the Tholen B and F types. The spectrum of this object suggests the presence of magnetite (Fe3O4), which gives it the spectrally-blue coloration that is a characteristic of this SMASS class. The spectrum of this asteroid also displays a band feature near 2.9 μm that indicate the presence of a hydrated mineral. This suggests that the asteroid has undergone significant water-based alteration.〔 335 Roberta was identified as one of three asteroids that were likely to be a parent body for chondrites along with 449 Hamburga and 304 Olga.〔(Lunar and planetary science: abstracts of papers submitted to the ... Lunar and Planetary Science Conference, Volume 27, Part 1 - Lunar and Planetary Institute, Jan 1, 1996 )〕 All three asteroids were known to have low-albedo (not reflect as much light) and be close to "meteorite producing resonances".〔(Lunar and planetary science: abstracts of papers submitted to the ... Lunar and Planetary Science Conference, Volume 27, Part 1 - Lunar and Planetary Institute, Jan 1, 1996 )〕 Chrondrites are the most common type of meteor found on Earth, accounting for over 80% of all meteors.〔(ASU - Chondrites )〕 They are named for the tiny spherical silicate particles that are found inside them (those particles are called chondrules).〔(ASU - Chondrites )〕 ==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「335 Roberta」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.