Zeta Capricorni

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ζ Capricorni
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Capricornus
Right ascension 21h26m40.0s
Declination −22°24′41″
Apparent magnitude (V) +3.77
Distance 398 ± 44 ly
(122 ± 13 pc)
Spectral type G8III + DA2.2[1]
Other designations
34 Capricorni HR 8204, HD 204075, CD−22°15388, FK5 806, HIP 105881, SAO 190341, GC 30020, ADS 14971, CCDM J21267-2225

Zeta Capricorni, (ζ Cap, ζ Capricorni), is a fourth-magnitude star in the constellation Capricornus. ζ Capricorni is a binary star, with the primary component ζ Capricorni A being a yellow G-type giant with an apparent magnitude of +3.77. It is considered one of the prototypical examples of a Barium star, properties of which include overabundances of carbon molecules (such as C2) and s-process elements. Zeta Capricorni has an overabundance of the s-process element praseodymium.

Its companion, ζ Capricorni B is a white dwarf.

The ζ Capricorni binary system is approximately 398 light years from Earth.

Chinese Name[edit]

In Chinese, 十二國 (Shíer Guó), meaning Twelve States, refers to an asterism which represents twelve ancient states in the Spring and Autumn period and the Warring States period, consisting of ζ Capricorni, φ Capricorni, ι Capricorni, 38 Capricorni, 35 Capricorni, 36 Capricorni, χ Capricorni, θ Capricorni, 30 Capricorni, 33 Capricorni, 19 Capricorni, 26 Capricorni, 27 Capricorni, 20 Capricorni, η Capricorni and 21 Capricorni.[2] Consequently, ζ Capricorni itself represents the state of Yan ().,[3] together with ν Ophiuchi in Left Wall of Heavenly Market Enclosure (asterism).[4]


  1. ^ Holberg, J. B.; Oswalt, T. D.; Sion, E. M.; Barstow, M. A.; Burleigh, M. R. (2013). "Where are all the Sirius-like binary systems?". Monthly Notices of the Royal Astronomical Society. 435 (3): 2077. arXiv:1307.8047Freely accessible. Bibcode:2013MNRAS.435.2077H. doi:10.1093/mnras/stt1433. 
  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. ^ Richard Hinckley Allen: Star Names — Their Lore and Meaning: Capricornus
  4. ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 23 日