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Psi Persei

ψ Persei
Location of ψ Persei (circled)
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]
Distance580 ± 20 ly
(179 ± 7 pc)
Absolute magnitude (MV)−2.03[7]
Details
Mass4.8[8] M☉
Radius5.5/7.26[9] R☉
Luminosity2,042[10] L☉
Surface gravity (log g)3.65[11] cgs
Temperature15,654[10] K
Rotational velocity (v sin i)275[11] km/s
Age63.1[12] Myr
Other designations
ψ Persei, ψ Per, Psi Per, 37 Persei, BD+47°857, GC 4287, HD 22192, HIP 16826, HR 1087, PPM 46127, SAO 46366[13]
Database references
SIMBADdata

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.

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