Theta Cephei

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Theta Cephei
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cepheus
Right ascension 20h 29m 34.83s
Declination +62° 59' 38.9"
Apparent magnitude (V) 4.21
Absolute magnitude (V) 1.11
Distance 136 ly
(41.72 pc)
Spectral type A7III
Other designations
2 Cephei, HD 195725, HR 7850, SAO 18897, FK5 767, NSV --, BD +62 1821, HIP 101093

Theta Cephei (θ Cep, θ Cephei) is a Class A7, fourth-magnitude star in the constellation Cepheus. Theta Cephei is a white spectroscopic binary star, located about 135 light-years from Earth. Shared with η Cep, this star have the title Al Kidr, meaning unknown[1]

In Chinese, 天鈎 (Tiān Gōu), meaning Celestial Hook, refers to an asterism consisting of 4 Cephei, HD 194298, η Cephei, α Cephei, ξ Cephei, 26 Cephei, ι Cephei and ο Cephei.[2] Consequently, θ Cephei itself is known as 天鈎三 (Tiān Gōu sān, English: the Third Star of Celestial Hook.).[3]


  1. ^ Star Name - R.H.Allen p. 155
  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) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 6 日

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