Misplaced Pages

The Bayer designation Tau Hydrae (τ Hya, τ Hydrae) is shared by two star systems in the equatorial constellation of Hydra. The two stars are separated by 1.74° in the sky.

• τ Hydrae, triple star system
• τ Hydrae, astrometric binary

The stars τ Hya and τ Hya, along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae), were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot. According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Uḳdah were the title for four stars: τ Hya as Uḳdah I, τ Hya as Uḳdah II, 33 Hya as Uḳdah III and ι Hya as Uḳdah IV

In Chinese, 柳宿 (Xīng Sù), meaning Star (asterism), refers to an asterism consisting of τ and τ Hydrae, Alphard, ι Hydrae, 26 Hydrae, 27 Hydrae, HD 82477 and HD 82428. Consequently, τ and τ Hydrae are known as 星宿二 (Xīng Sù èr, English: the Second Star of Star) and 星宿三 (Xīng Sù sān, English: the Third Star of Star) respectively.

References

1. Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc. p. 250. ISBN 0-486-21079-0. Retrieved 2010-12-12.
2. Jack W. Rhoads - Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971
3. (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
4. (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 29 日

External links

• Olympic Doubles
• The Belt of Venus amateur observation page
• Tau Hydrae Elite Dangerous - trade database

• Set index articles on astronomical objects
• Bayer objects
• Hydra (constellation)
• Stars with proper names