Epoch J2000.0 Equinox J2000.0
|Right ascension||8h 38m 45.4s|
|Declination||3° 20' 29"|
|Apparent magnitude (V)||4.44|
Sigma Hydrapp (σ Hydrae, σ Hya) is the 4th-magnitude star in the constellation Hydra. Sigma Hydrae belongs to spectral class K1+III and has apparent magnitude +4.44. It is approximately 353 light years from Earth
It is also known by the proper name Minchir, and appears as Minchir es-schudscha' on Bode's large star atlas, Uranographia, which is derived from the Arabic Minkhir al-Shuja‘, "the Nostril of Hydra", for this star. The name is erroneously spelt as Al Minliar al Shuja in the Yale Bright Star Catalogue..
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Min al Azʽal or Minazal were the title for five stars : δ Hya as Minazal I, η Hya as Minazal II, ε Hya as Minazal III, ρ Hya as Minazal IV and ζ Hya as Minazal V (exclude this star)
In Chinese, 柳宿 (Liǔ Sù), meaning Willow (asterism), refers to an asterism consisting of σ Hydrae, δ Hydrae, η Hydrae, ρ Hydrae, ε Hydrae, ζ Hydrae, ω Hydrae and θ Hydrae Consequently, σ Hydrae itself is known as 柳宿二 (Liǔ Sù èr, English: the Second Star of Willow.).
- "HD 73471 -- Variable Star". SIMBAD Astronomical Database. Retrieved 2006-11-05.
- Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc. p. 249. ISBN 0-486-21079-0. Retrieved 2010-12-12.
- 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
- (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.
- (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 28 日
- Encyclopaedia of the history of science, technology, and medicine in non-western cultures, ed. Helaine Selin, Dordrecht, Kluwer Academic Publishers, 1997, p.105.