Lambda Cephei
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 22h 11m 30.576s |
| Declination | +59° 24′ 52.15″ |
| Apparent magnitude (V) | +5.050 |
| Characteristics | |
| Evolutionary stage | Blue supergiant |
| Spectral type | O6.5If(n)p |
| U−B color index | −0.622 |
| B−V color index | +0.237 |
| Astrometry | |
| Radial velocity (Rv) | -75.10 km/s |
| Proper motion (μ) | RA: -7.46 mas/yr Dec.: -11.09 mas/yr |
| Parallax (π) | 1.65±0.22 mas |
| Distance | 950 pc |
| Absolute magnitude (MV) | -6.43 |
| Details | |
| Mass | 51.4 M☉ |
| Radius | 18 - 21 R☉ |
| Luminosity | 630,000 L☉ |
| Surface gravity (log g) | 3.54 cgs |
| Temperature | 36,000 K |
| Rotation | 210 |
| Age | 4.0 Myr |
| Other designations | |
| Lambda Cephei, 22 Cephei, HD 210839, HR 8469, BD+58 2402, HIP 109556, SAO 34149, GSC 03981-01585, GC 31066 | |
| Database references | |
| SIMBAD | data |
Lambda Cephei (λ Cephei) is a fifth magnitude blue supergiant star in the constellation Cepheus, one of the hottest and most luminous visible to the naked eye.