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Mu Canis Majoris (μ Canis Majoris, 18 Canis Majoris), also known as HR 2593 and BD-13°1741; is a quadruple star complex located in the constellation Canis Major. The multiple star is located at right ascension and declination .〔〔 The brighter two components can be split in a small telescope.The star system is estimated to be from the Sun.〔 The star has the traditional names Isida and Isis.〔〔 ==Associated stars== 〔〔 ;Mu Canis Majoris A (HD 51250): (,) A K3III giant star with a naked eye apparent magnitude of 5,〔 and an absolute magnitude of -2.22. Mu Canis Majoris has a mass of 3.1 Solar masses. Mu CMa is about 390 times fainter than the brightest star in the night sky Sirius.〔 ;Mu Canis Majoris B (HD 51251): (,) A B9.5V star with an apparent magnitude of 7.6.〔 ;Mu Canis Majoris C (BD-13°1741 C): (,) A star with an apparent magnitude of 10.2 〔 ;Mu Canis Majoris D (BD-13°1741 D): (,) a star with an apparent magnitude of 10.5 〔 Mu CMa should not be confused with the 9th magnitude variable star MU CMa located near NGC 2360.〔 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「Mu Canis Majoris」の詳細全文を読む スポンサード リンク
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