V381 Cephei
Triple star system in the constellation Cepheus / From Wikipedia, the free encyclopedia
V381 Cephei (HR 8164) is a triple star system in the northern constellation of Cepheus. Its apparent magnitude is slightly variable between 5.5 and 5.7.
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
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Constellation | Cepheus |
Right ascension | 21h 19m 15.682s[1] |
Declination | +58° 37′ 24.550″[1] |
Apparent magnitude (V) | 5.51 - 5.71[2] |
Characteristics | |
Spectral type | M1epIb + B[3] |
U−B color index | 0.00[4] |
B−V color index | +1.34[4] |
Variable type | Lc[2] |
Astrometry | |
Radial velocity (Rv) | −14.10[5] km/s |
Proper motion (μ) | RA: −1.435[6] mas/yr Dec.: −5.427[6] mas/yr |
Parallax (π) | 1.59 ± 0.23 mas[6] |
Distance | approx. 2,100 ly (approx. 630 pc) |
Absolute magnitude (MV) | −5.2[7] |
Details | |
Aa | |
Mass | 7.2[8] - 16[9] M☉ |
Radius | 977[10] R☉ |
Luminosity | 178,000[10] L☉ |
Temperature | 3,745±170[1][10] K |
Ab | |
Mass | 13[9] M☉ |
B | |
Mass | 7.1[11] M☉ |
Radius | 3.4[12] R☉ |
Luminosity | 1,487[12] L☉ |
Surface gravity (log g) | 4.18[12] cgs |
Temperature | 19,965[12] K |
Metallicity [Fe/H] | −0.30[11] dex |
Rotational velocity (v sin i) | 42.8[13] km/s |
Age | 49.1[8] Myr |
Other designations | |
A: HD 203338 | |
B: HD 203339 | |
Database references | |
A | |
B |
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