4 Persei

4 Persei is a single^[10] star in the northern constellation of Perseus, located around 670 light years away from the Sun.^[1] It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 5.04^[2] The Bayer designation for this star is g Persei; 4 Persei is the Flamsteed designation. This object has a peculiar velocity of 26.3 km/s and may be a runaway star.^[11]

4 Persei

Location of 4 Persei (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Perseus
Right ascension	02h 02m 18.11081s[1]
Declination	54° 29′ 15.1488″[1]
Apparent magnitude (V)	5.04[2]
Characteristics
Spectral type	B8 III[3]
U−B color index	−0.32[2]
B−V color index	−0.08[2]
Astrometry
Radial velocity (Rv)	−2.30[4] km/s
Proper motion (μ)	RA: +32.886[1] mas/yr Dec.: −3.515[1] mas/yr
Parallax (π)	4.2743±0.1856 mas[1]
Distance	760 ± 30 ly (230 ± 10 pc)
Absolute magnitude (MV)	−1.75[5]
Details
Radius	3.2[6] R☉
Luminosity	670[5] L☉
Surface gravity (log g)	4.19[7] cgs
Temperature	12,230[7] K
Metallicity [Fe/H]	+0.30[7] dex
Rotational velocity (v sin i)	60[8] km/s
Other designations
g Persei, 4 Per, BD+53°439, FK5 1054, GC 2442, HD 12303, HIP 9505, HR 590, SAO 22859[9]
Database references
SIMBAD	data

The stellar classification for 4 Persei is B8 III,^[3] matching an aging B-type giant star that has evolved off the main sequence. It is spinning with a projected rotational velocity of 60 km/s^[8] and has about 3.2^[6] times the Sun's radius The star is radiating 670^[5] times the luminosity of the Sun from its photosphere at an effective temperature of 12,230 K.^[7] 4 Persei is embedded in a small, relatively dense dust cloud, which is resulting in infrared emission from the cold dust.^[12]