Alpha2 Capricorni
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Capricornus |
| Right ascension | 20h 18m 03.3s |
| Declination | −12° 32′ 41″ |
| Apparent magnitude (V) | +3.58 |
| Absolute magnitude (V) | +0.98+0.07 −0.06[1] |
| Distance | 109±3 ly (33±1 pc) |
| Spectral type | G8 IIIb |
| Other designations | |
- For other star systems with a similar Bayer designation, see Alpha Capricorni.
Alpha² Capricorni (α² Capricorni, abbreviated Alpha² Cap, α² Cap), also named Algedi,[2] is a star in the constellation of Capricornus. It is a yellow G-type giant with an apparent magnitude of +3.58 and is approximately 109 light years from the Sun. It forms part of the double star Alpha Capricorni along with α¹ Capricorni.
Nomenclature
α² Capricorni (Latinised to Alpha² Capricorni) is the star's Bayer designation.
It bore the traditional names Secunda Giedi or Algiedi Secunda and shared the name Algedi (from the Arabic الجدي al-jadii 'the goat') with α¹ Capricorni. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[3] to catalogue and standardize proper names for stars. The WGSN approved the name Algedi for α² Capricorni on 21 August 2016 and it is now so entered in the IAU Catalog of Star Names.[2]
In Chinese, 牛宿 (Niú Su), meaning Ox (asterism), refers to an asterism consisting of α² Capricorni, Beta Capricorni, ξ² Capricorni, Pi Capricorni, Omicron Capricorni and Rho Capricorni.[4] Consequently, α² Capricorni itself is known as 牛宿二 (Niú Su èr, English: the Second Star of Ox.)[5]
References
- ↑ Carney, Bruce W.; et al. (March 2008), "Rotation and Macroturbulence in Metal-Poor Field Red Giant and Red Horizontal Branch Stars", The Astronomical Journal, 135 (3): 892–906, arXiv:0711.4984
, Bibcode:2008AJ....135..892C, doi:10.1088/0004-6256/135/3/892 - 1 2 "IAU Catalog of Star Names". Retrieved 28 July 2016.
- ↑ IAU Working Group on Star Names (WGSN), International Astronomical Union, retrieved 22 May 2016.
- ↑ (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) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.
External links
- Kaler, Jim (2005). "Algedi". Retrieved July 27, 2005.