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InCelestia
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 21h28m 39.58s |
| Declination | +70° 33' 38.5" |
| Apparent magnitude (V) | 3.23 |
| Absolute magnitude (V) | -3.08 |
| Distance | 595 ly (182.51 pc) |
| Spectral type | B2IIIv |
| Other designations | |
8 Cephei, HD 205021, HR 8238, SAO 10057, FK5 809, NSV --, BD +69 1173, HIP 106032 | |
Beta Cephei (β Cep / β Cephei) is a star in the constellation Cepheus. It also has the traditional name Alfirk (Arabic الفرقة al-firqah), meaning "The Flock" (referring to a flock of sheep).
Beta Cephei is the prototype of the Beta Cephei variable stars. Its magnitude varies between +3.15 and +3.21 with a period of 0.1904844 days. It belongs to the spectral class B2IIIev and is 595 light years from Earth.
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