Nu Cephei
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 21h 45m 26.925s |
| Declination | +61° 07′ 14.900″ |
| Apparent magnitude (V) | 4.289 (4.25 to 4.35) |
| Characteristics | |
| Evolutionary stage | Blue supergiant |
| Spectral type | A2Iab |
| Apparent magnitude (U) | 4.94 |
| Apparent magnitude (B) | 4.81 |
| Apparent magnitude (J) | 3.14 |
| Apparent magnitude (K) | 2.85 |
| U−B color index | +0.119 |
| B−V color index | +0.518 |
| Variable type | Alpha Cygni |
| Astrometry | |
| Radial velocity (Rv) | −25.90 km/s |
| Proper motion (μ) | RA: −3.545 mas/yr Dec.: −2.025 mas/yr |
| Parallax (π) | 0.9321±0.0865 mas |
| Distance | 3,500 ± 300 ly (1,070 ± 100 pc) |
| Absolute magnitude (MV) | −6.82 |
| Details | |
| Mass | 15.4 M☉ |
| Radius | 137 R☉ |
| Luminosity | 102,000 L☉ |
| Surface gravity (log g) | 1.35 cgs |
| Temperature | 8,800 K |
| Rotational velocity (v sin i) | 15 km/s |
| Age | 8 Myr |
| Other designations | |
| ν Cep, 10 Cephei, BD+60°2288, FK5 1572, HD 207260, HIP 107418, HR 8334, SAO 19624 | |
| Database references | |
| SIMBAD | data |
Nu Cephei is a blue-hued variable star in the northern constellation Cepheus. Its name is a Bayer designation that is Latinized from ν Cephei, and abbreviated Nu Cep or ν Cep. This is a pulsating α Cygni variable star that ranges in apparent visual magnitude from 4.25 to 4.35. This is bright enough to make it visible to the naked eye as a fourth-magnitude star. Distance estimates place it at about 3,500 light-years from Earth. It is drifting closer to the Sun with a line of sight velocity component of −26 km/s.
ν Cephei is a member of the Cepheus OB2 stellar association, which includes stars such as μ Cephei and VV Cephei.