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Sigma Ursae Majoris : ウィキペディア英語版 | Sigma Ursae Majoris
The Bayer designation Sigma Ursae Majoris (σ UMa, σ Ursae Majoris) is shared by two star systems in the constellation Ursa Major: * Sigma¹ Ursae Majoris (11 Ursae Majoris) * Sigma² Ursae Majoris (13 Ursae Majoris) They are separated by 0.33° in the sky. The two stars, Sigma¹ and Sigma² together, are considered an optical double star. They are not a binary star, in that they are not gravitationally linked, but they are close to each other as seen in the sky.
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 Ursae Majoris」の詳細全文を読む
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