Sigma Ursae Majoris
From Infogalactic: the planetary knowledge core
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.
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