Nu Persei

ν Persei, Latinized as Nu Persei, is a single^[13] star and a suspected variable in the northern constellation of Perseus. It has a yellow-white hue and is visible to the naked eye with an apparent visual magnitude of 3.80.^[2] This object is located approximately 560 light-years from the Sun based on parallax^[1] but is drifting closer with a radial velocity of −12 km/s.^[5]

Nu Persei

Location of ν Persei (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Perseus
Right ascension	03h 45m 11.63204s[1]
Declination	+42° 34′ 42.7829″[1]
Apparent magnitude (V)	3.80[2]
Characteristics
Spectral type	F5II[3]
U−B color index	+0.28[2]
B−V color index	+0.42[2]
Variable type	suspected[4]
Astrometry
Radial velocity (Rv)	−12.10[5] km/s
Proper motion (μ)	RA: −14.45[1] mas/yr Dec.: +2.53[1] mas/yr
Parallax (π)	5.86±0.22 mas[1]
Distance	560 ± 20 ly (171 ± 6 pc)
Absolute magnitude (MV)	−2.39[6]
Details
Mass	5.01[7] M☉
Radius	20.62+1.72 −1.76[8] R☉
Luminosity	603.6±41.2[8] L☉
Surface gravity (log g)	3.04[9] cgs
Temperature	6,300+287 −158[8] K
Metallicity [Fe/H]	+0.41[9] dex
Rotational velocity (v sin i)	48.9[10] km/s
Age	109[11] Myr
Other designations
ν Per, 41 Persei, NSV 1261, BD+42°815, FK5 134, GC 4474, HD 23230, HIP 17529, HR 1135, SAO 39078, CCDM J03452+4235A, WDS J03452+4235A[12]
Database references
SIMBAD	data

This object is a highly luminous bright giant star with a stellar classification of F5II.^[3] It has five^[7] times the mass of the Sun but has expanded to around 21^[8] times the Sun's radius. The star has a relatively high rotation rate, spinning with a projected rotational velocity of 48.9 km/s.^[10] It is radiating 604^[8] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 6,300 K.^[8]

Several visual companions beside the primary have been recorded. B, with magnitude 12.1 and separation 31.6", has its own companion, E, with magnitude 14.3 and separation 7.7". Additionally, C has magnitude 13.2 and separation 55.7", and D has magnitude 13.8 and separation 22.8".^[14]