Theta Capricorni

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θ Capricorni
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Capricornus
Right ascension 21h05m56.8s
Declination −17°13′58″
Apparent magnitude (V) +4.08
Distance 158 ± 7 ly
(49 ± 2 pc)
Spectral type A1V
Other designations
23 Capricorni, HR 8075, HD 200761, BD−17°6174, FK5 1552, HIP 104139, SAO 164132, GC 29460

Theta Capricorni (θ Cap, θ Capricorni) is a star in the constellation Capricornus. θ Capricorni is a white A-type main sequence dwarf with an apparent magnitude of +4.08. It is approximately 158 light years from Earth.

Sometimes, this star is called by the name Dorsum,[1] meaning the back (of the goat) in Latin.

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 θ Capricorni, φ Capricorni, ι Capricorni, 38 Capricorni, 35 Capricorni, 36 Capricorni, χ Capricorni, 30 Capricorni, 33 Capricorni, ζ Capricorni, 19 Capricorni, 26 Capricorni, 27 Capricorni, 20 Capricorni, η Capricorni and 21 Capricorni.[2] Consequently, θ Capricorni itself is known as 秦一 (Qin yī, English: the First Star of Qin), meaning that this star (together with 30 Capricorni and δ Serpentis in Right Wall of Heavenly Market Enclosure (asterism)[3]) represents the state Qin () (or Tsin)[4]


  1. ^ "Dorsum". 
  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. ^ "LacusCurtius • Allen's Star Names — Serpens". 
  4. ^ "Deneb Algedi".