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 | |
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.).
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