4 Persei
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 02h 02m 18.11081s |
| Declination | 54° 29′ 15.1488″ |
| Apparent magnitude (V) | 5.04 |
| Characteristics | |
| Spectral type | B8 III |
| U−B color index | −0.32 |
| B−V color index | −0.08 |
| Astrometry | |
| Radial velocity (Rv) | −2.30 km/s |
| Proper motion (μ) | RA: +32.886 mas/yr Dec.: −3.515 mas/yr |
| Parallax (π) | 4.2743±0.1856 mas |
| Distance | 760 ± 30 ly (230 ± 10 pc) |
| Absolute magnitude (MV) | −1.75 |
| Details | |
| Radius | 3.2 R☉ |
| Luminosity | 670 L☉ |
| Surface gravity (log g) | 4.19 cgs |
| Temperature | 12,230 K |
| Metallicity [Fe/H] | +0.30 dex |
| Rotational velocity (v sin i) | 60 km/s |
| Other designations | |
| g Persei, 4 Per, BD+53°439, FK5 1054, GC 2442, HD 12303, HIP 9505, HR 590, SAO 22859 | |
| Database references | |
| SIMBAD | data |
4 Persei is a single star in the northern constellation of Perseus, located around 670 light years away from the Sun. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 5.04 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.
The stellar classification for 4 Persei is B8 III, 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 and has about 3.2 times the Sun's radius The star is radiating 670 times the luminosity of the Sun from its photosphere at an effective temperature of 12,230 K. 4 Persei is embedded in a small, relatively dense dust cloud, which is resulting in infrared emission from the cold dust.