V381 Cephei

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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
Spectral type M1Ibpe+
Apparent magnitude (B) 7.04
B−V color index 1.38
Variable type Pulsating Variable
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
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, HD 203338

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.

See also[edit]