Magnitude 4.21 Apparent magnitude (V) 4.21 | Constellation Cepheus | |
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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
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. Consequently, θ Cephei itself is known as 天鈎三 (Tiān Gōu sān, English: the Third Star of Celestial Hook.).
References
Theta Cephei Wikipedia(Text) CC BY-SA