Astronomy:Nu Boötis
From HandWiki
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 0.175° on the sky.[1] 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.[2]
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.[3]
References
- ↑ Gater, Will (2020). The Practical Astronomer: Explore the Wonders of the Night Sky. Penguin. ISBN 9780744084382. https://books.google.com/books?id=332AEAAAQBAJ&pg=PA95. 10′ 30″ is equivalent to 0.175°.
- ↑ Script error: The function "in_lang" does not exist. AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 26 日
- ↑ "Bayer's Uranometria and Bayer letters". http://www.ianridpath.com/startales/bayer.htm.
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