翻訳と辞書 Words near each other ・ Sigma Virginis ・ Sigma Virus ・ Sigma Beta Rho ・ Sigma bond ・ Sigma Boötis ・ Sigma Cancri ・ Sigma Canis Majoris ・ Sigma Capricorni ・ Sigma Cassiopeiae ・ Sigma Centauri ・ Sigma Ceti ・ Sigma Chi ・ Sigma Columbae ・ Sigma constant ・ Sigma coordinate system ・ Sigma Coronae Borealis ・ Sigma Corporation ・ Sigma Cygni ・ Sigma Delta ・ Sigma Delta Alpha ・ Sigma Delta Chi (sorority) ・ Sigma Delta Chi Award ・ Sigma Delta Pi ・ Sigma Delta Rho ・ Sigma Delta Tau ・ Sigma Derby ・ Sigma Designs ・ Sigma discography ・ Sigma dp0 Quattro ・ Sigma DP1 Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Sigma Coronae Borealis ： ウィキペディア英語版 Sigma Coronae Borealis Sigma Coronae Borealis is a quintuple star system in the constellation Corona Borealis, the main components of which are three sunlike stars. Appearing as a single star of apparent magnitude 5.3 to the unaided eye, Sigma can be separated into 6.6-magnitude Sigma1 and 5.64-magnitude Sigma2 when observed with a telescope.〔 The two take 726 years to orbit each other. The orbit of Sigma1 is eccentric, with an average distance of 128 AU, and a minimum of 31 AU and maximum of 225 AU.〔 Sigma1 is a yellow main sequence star of spectral type G1V and weighing around 1 solar mass.〔 Sigma2 is a spectroscopic binary system composed of two stars very close (6 solar radii) together that orbit each other every 1.14 days.〔 These stars are 1.14 and 1.09 times as massive as the Sun,〔 with spectral types F9V and G0V respectively.〔 Each has a diameter around 1.2 times that of the Sun.〔 They rotate each other very rapidly, and are very active as a result, with prominent star spots and are classed as RS Canum Venaticorum variables.〔 The system emits radio waves.〔 Much further away, at a distance of 14,000 astronomical units (AU), are a pair of red dwarf stars that take 52 years to rotate each other.〔 This pair has a combined apparent magnitude of 12.24.〔 Another pair of faint stars that appear nearby were found to be unrelated.〔 The system is thought to be anywhere from 100 million to 3 billion years old, from measurement of lithium in its spectrum.〔 Its parallax was measured in 1999, yielding a distance of 74.2 light-years.〔 ==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「Sigma Coronae Borealis」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.