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 G4Ib Ba2
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 supergiant 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.[1] Consequently, ζ Capricorni itself represents the state of Yan ().,[2] together with ν Ophiuchi in Left Wall of Heavenly Market Enclosure (asterism).[3]