Omega Capricorni

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ω Capricorni
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Capricornus
Right ascension 20h51m49.3s
Declination −26°55′09″
Apparent magnitude (V) +4.12
Distance 630 ± 120 ly
(193 ± 35 pc)
Spectral type M0-III-IIIbBa0.2
Other designations
18 Capricorni, HR 7980, HD 198542, CD−27°15082, FK5 1546, HIP 102978, SAO 189781, GC 29079

Omega Capricorni (ω Cap, ω Capricorni) is a star in the constellation Capricornus, with the traditional but seldom used name Baten Algiedi, which is Arabic for "belly of the goat".

In Chinese, 天田 (Tiān Tián), meaning Celestial Farmland, refers to an asterism consisting of ω Capricorni, 3 Piscis Austrini, 24 Capricorni and ψ Capricorni.[1] Consequently, ω Capricorni itself is known as 天田二 (Tiān Tián èr, English: the First Star of Celestial Farmland.)[2]

ω Capricorni is a M-type red giant with an apparent magnitude of +4.12. It is also classed as a variable star because of its regular fluctuations in luminosity and absolute magnitude. It is approximately 630 light years from Earth.


  1. ^ (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.
  2. ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 3 日