Astronomy:Sigma Ursae Majoris
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The Bayer designation σ Ursae Majoris (Sigma Ursae Majoris, σ UMa) is shared by two star systems in the constellation Ursa Major:
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.
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