Nu Boötis

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Location of the ν Boötis pair (circled)
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Location of the ν Boötis pair (circled)

The Bayer designation Nu Boötis (ν Boo / ν Boötis) is shared by two star systems, in the constellation Boötes:

They are separated by 0.17° on the sky. They have almost identical visual magnitudes, but contrasting colours: ν1 is a yellow giant star, while ν2 is a close binary with two white main sequence stars.

Both stars were members of asterism 七公 (Qī Gōng), Seven Excellencies, Heavenly Market enclosure.[1]

Ptolemy considered Nu Boötis to be shared by Hercules, and Bayer assigned it a designation in both constellations: Nu Boötis (ν Boo) and Psi Herculis (ψ Her). When the modern constellation boundaries were fixed in 1930, the latter designation dropped from use.[2]