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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 LP 944-020 ： ウィキペディア英語版 LP 944-20 LP 944-20 is a dim brown dwarf of spectral class M9 located about 21 light-years from the Solar System in the constellation of Fornax. With a visual apparent magnitude of 18,〔 it has one of the dimmest visual magnitudes listed on the RECONS page. On 15 December 1999 a flare was detected.〔http://www.solstation.com/stars/lp944-20.jpg〕 ==Distance== The first parallax measurement from 1996 found that LP 944-20 (designated there as BRI 0337−3535) has a relative parallax of $\backslash pi\_r=200.0\backslash pm4.2$ mas, and its correction from relative to absolute parallax (i.e. mean parallax of the reference frame stars) is $\backslash pi\_=1.4\backslash pm0.3$ mas. This yields an absolute parallax of $\backslash pi\_r+\backslash pi\_=200.0+1.4=201.4$ mas, with a standard deviation (according to $\backslash sigma\_^2=\backslash sigma\_X^2+\backslash sigma\_Y^2$〔(Mean and Variance of Random Variables )〕) of $\backslash sqrt\}^2\}=\backslash sqrt=4.21$ mas, which corresponds to a distance of pc, or ly.〔 〕 (The same values of absolute parallax and its standard deviation are in the RECONS' TOP100 list.〔In RECONS' TOP100 older versions the standard deviation value was 4.20 mas, not 4.21 mas.〕 A newer parallax, published in 2013, is mas ( pc or ly).〔 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「LP 944-20」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.