Psi Persei
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 03h 36m 29.37982s |
| Declination | +48° 11′ 33.4789″ |
| Apparent magnitude (V) | 4.17 - 4.28 |
| Characteristics | |
| Spectral type | B5Ve |
| U−B color index | −0.56 |
| B−V color index | −0.06 |
| Variable type | γ Cas |
| Astrometry | |
| Radial velocity (Rv) | −1.1 km/s |
| Proper motion (μ) | RA: +22.55 mas/yr Dec.: −27.78 mas/yr |
| Parallax (π) | 5.59±0.22 mas |
| Distance | 580 ± 20 ly (179 ± 7 pc) |
| Absolute magnitude (MV) | −2.03 |
| Details | |
| Mass | 4.8 M☉ |
| Radius | 5.5/7.26 R☉ |
| Luminosity | 2,042 L☉ |
| Surface gravity (log g) | 3.65 cgs |
| Temperature | 15,654 K |
| Rotational velocity (v sin i) | 275 km/s |
| Age | 63.1 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 | |
| Database references | |
| SIMBAD | data |
Psi Persei (Psi Per, ψ Persei, ψ Per) is a single 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.