Alpha2 Capricorni

α² Capricorni

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Capricornus
Right ascension	20^h 18^m 03.3^s
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
Gredi, Algedi, Secunda Giedi, Algiedi Secunda, 6 Capricorni, HR 7754, HD 192947, BD−12°5685, FK5 761, HIP 100064, SAO 163427, GC 28200, ADS 13645, CCDM J20181-1233

For other star systems with this Bayer designation, see Alpha Capricorni.

Alpha² Capricorni (α² Cap, α² Capricorni) is a star in the constellation Capricornus. It also has the traditional star name Secunda Giedi or Algiedi Secunda, and shares the name Algedi (from الجدي - al-jadii, meaning the goat) with α¹ Capricorni.

In Chinese, 牛宿 (Niú Su), meaning Ox (asterism), refers to an asterism consisting of α² Capricorni, β Capricorni, ξ² Capricorni, π Capricorni, ο Capricorni and ρ Capricorni.^[2] Consequently, α² Capricorni itself is known as 牛宿二 (Niú Su èr, English: the Second Star of Ox.)^[3]

α² Capricorni is a yellow G-type giant with an apparent magnitude of +3.58. It is approximately 109 light years from Earth.

References

1. 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
2. (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.
3. (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.