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R Hydrae
R Hydrae, also known as R Hya,〔 is a Mira-type variable star in the constellation Hydra.〔(AAVSO )〕〔(SIMBAD )〕 The magnitude of R Hydrae varies over a period of 389 days, between 3.21 and 11.00. The period of R Hydrae changes slowly. At maximum brightness the star can be seen with the naked eye, while at minimum a telescope of at least 5 cm is needed. R Hydrae is approximately 2000 light years from Earth. R Hydrae's spectral class is M7IIIe.〔 ==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「R Hydrae」の詳細全文を読む
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