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Psi Persei
Star in the constellation Perseus / From Wikipedia, the free encyclopedia
Psi Persei (Psi Per, ψ Persei, ψ Per) is a single[7] Be star in the northern constellation of Perseus. It has an apparent visual magnitude of about 4.2, so it is visible to the naked eye at night under suitably dark skies. Based on parallax measurements, it is located at a distance of roughly 580 light-years (180 parsecs) from the Earth.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Perseus |
Right ascension | 03h 36m 29.37982s[1] |
Declination | +48° 11′ 33.4789″[1] |
Apparent magnitude (V) | 4.17 - 4.28[2] |
Characteristics | |
Spectral type | B5Ve[3] |
U−B color index | −0.56[4] |
B−V color index | −0.06[4] |
Variable type | γ Cas[5] |
Astrometry | |
Radial velocity (Rv) | −1.1[6] km/s |
Proper motion (μ) | RA: +22.55[1] mas/yr Dec.: −27.78[1] mas/yr |
Parallax (π) | 5.59 ± 0.22 mas[1] |
Distance | 580 ± 20 ly (179 ± 7 pc) |
Absolute magnitude (MV) | −2.03[7] |
Details | |
Mass | 4.8[8] M☉ |
Radius | 5.5/7.26[9] R☉ |
Luminosity | 2,042[10] L☉ |
Surface gravity (log g) | 3.65[11] cgs |
Temperature | 15,654[10] K |
Rotational velocity (v sin i) | 275[11] km/s |
Age | 63.1[12] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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