4 Persei
Star in the constellation Perseus
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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]
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| 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]