W Cephei
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 22h 36m 27.56307s |
| Declination | +58° 25′ 33.9554″ |
| Apparent magnitude (V) | 6.83 - 9.20 |
| Characteristics | |
| Evolutionary stage | Red supergiant + non-supergiant B class star |
| Spectral type | K0ep-M2ep Ia + B0/B1 |
| Variable type | SRc |
| Astrometry | |
| Radial velocity (Rv) | −44.64 km/s |
| Proper motion (μ) | RA: −3.176 mas/yr Dec.: −2.277 mas/yr |
| Distance | 2,427 pc |
| Absolute magnitude (MV) | −7 + −3.5 |
| Orbit | |
| Period (P) | 2,075 d |
| Eccentricity (e) | 0.149 |
| Inclination (i) | 90° |
| Details | |
| Radius | 666.2+20.7 −11.1 R☉ |
| Luminosity | 292,000 L☉ |
| Surface gravity (log g) | 0.18 cgs |
| Temperature | 3,681 – 4,400 K |
| Metallicity | 0.0205 |
| Other designations | |
| W Cep, BD+57°2568, HD 214369, HIP 111592, GSC 03995-00937, SAO 34614, PPM 40864, GC 31569, UCAC3 297-183471, IRAS 22345+5809, 2MASS J22362757+5825340, AAVSO 2232+57 | |
| Database references | |
| SIMBAD | data |
W Cephei is a spectroscopic binary and variable star located in the constellation Cepheus. It is thought to be a member of the Cep OB1 stellar association at about 8,000 light years. The supergiant primary star is one of the largest known stars and as well as one of the most luminous red supergiants.