V381 Cephei
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 21h 19m 15.6880s |
| Declination | +58° 37′ 24.607″ |
| Apparent magnitude (V) | 5.66 |
| Characteristics | |
| Spectral type | M1Ibpe+ |
| Apparent magnitude (B) | 7.04 |
| B−V color index | 1.38 |
| Variable type | Pulsating Variable |
| Astrometry | |
| Radial velocity (Rv) | -20.6 km/s |
| Proper motion (μ) | RA: -3.55 mas/yr Dec.: -3.28 mas/yr |
| Parallax (π) | 0.89 ± 1.15 mas |
| Distance | 3663 ly (1123 pc) |
| Absolute magnitude (MV) | -4.59 |
| Details | |
| Mass | 9.5 M☉ |
| Radius | 327 R☉ |
| Luminosity | 18,000 L☉ |
| Temperature | 3,630 K |
| Age | ~25 million years |
| Other designations | |
V381 Cephei (HR 8164) is a pulsating variable star in the northern constellation of Cepheus. It is a red supergiant of class M1Ibpe+ and probably has a mass of about 9 or 10 solar masses. It also has an apparent magnitude of 5.66 and is about 3,600 light years away.
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