31 Persei is a single[13] star in the northern constellation of Perseus. It is visible to the naked eye as a dim, blue-white hued point of light with an apparent visual magnitude of 5.05.[2] This star is located around 172 parsecs (560 ly) away from the Sun,[14] and it is drifting closer with a radial velocity of −1.6 km/s.[5] It is likely a member of the Alpha Persei Cluster.[15]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Perseus |
Right ascension | 03h 19m 07.63796s[1] |
Declination | 50° 05′ 41.8724″[1] |
Apparent magnitude (V) | 5.05[2] |
Characteristics | |
Spectral type | B5V[3] |
U−B color index | −0.53[4] |
B−V color index | −0.06[4] |
Astrometry | |
Radial velocity (Rv) | −1.60[5] km/s |
Proper motion (μ) | RA: +23.580[1] mas/yr Dec.: −23.322[1] mas/yr |
Parallax (π) | 5.8399 ± 0.1792 mas[1] |
Distance | 560 ± 20 ly (171 ± 5 pc) |
Absolute magnitude (MV) | −1.44[6] |
Details | |
Mass | 4.647[7] M☉ |
Radius | 3.4[8] R☉ |
Luminosity | 950[6] L☉ |
Temperature | 15,301[6] K |
Metallicity [Fe/H] | 0.00[9] dex |
Rotational velocity (v sin i) | 260[10] km/s |
Age | 234[11] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This object is a massive B-type main-sequence star with a stellar classification of B5V[3] and it is currently generating energy through hydrogen fusion at its core. It is around 234[9] million years old and is spinning rapidly with a projected rotational velocity of 260 km/s.[10] The star has 4.6[7] times the mass of the Sun and about 3.4[8] times the radius of the Sun. It is radiating 950[6] times the luminosity of the Sun from its photosphere at an effective temperature of 15,301 K.[6]