W Cephei
Variable star in the constellation Cepheus / From Wikipedia, the free encyclopedia
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Not to be confused with VV Cephei.
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.[5][11] The supergiant primary star is one of the largest known stars and as well as one of the most luminous red supergiants.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cepheus |
Right ascension | 22h 36m 27.56307s[2] |
Declination | +58° 25′ 33.9554″[2] |
Apparent magnitude (V) | 6.83 - 9.20[3] |
Characteristics | |
Evolutionary stage | Red supergiant + non-supergiant B class star |
Spectral type | K0ep-M2ep Ia + B0/B1[3] |
Variable type | SRc[3] |
Astrometry | |
Radial velocity (Rv) | −44.64[4] km/s |
Proper motion (μ) | RA: −3.176[2] mas/yr Dec.: −2.277[2] mas/yr |
Distance | 2,427[5] pc |
Absolute magnitude (MV) | −7[6] + −3.5[7] |
Orbit[8] | |
Period (P) | 2,075 d |
Eccentricity (e) | 0.149 |
Inclination (i) | 90° |
Details | |
Radius | 666;[2] R☉ |
Luminosity | 292,000[9] L☉ |
Surface gravity (log g) | 0.18[2] cgs |
Temperature | 3,681[9] – 4,400[10] K |
Other designations | |
Database references | |
SIMBAD | data |
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