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RR Coronae Borealis : ウィキペディア英語版 | RR Coronae Borealis
RR Coronae Borealis (RR CrB, HD 140297, HIP 76844) is a M3-type semiregular variable star located in the constellation Corona Borealis with a parallax of 2.93mas being a distance of .〔SIMBAD, (RR Coronae Borealis ) (accessed 20 February 2013)〕 It varies between magnitudes 7.3 and 8.2 over 60.8 days. Located around 1228 light-years distant, it shines with a luminosity approximately 2180 times that of the Sun and has a surface temperature of 3309 K. ==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「RR Coronae Borealis」の詳細全文を読む
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