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HD 12139 is a double star in the constellation Aries. With an apparent magnitude of 5.89, the stars can be seen by the naked eye under good conditions in rural areas. The system is located approximately distant, and the brighter star is a red giant, meaning that it has used up its core hydrogen and is expanding. ==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「HD 12139」の詳細全文を読む スポンサード リンク
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