| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Perseus |
| Right ascension | 02h17m 59.88750s[1] |
| Declination | +57° 53′ 59.3529″[1] |
| Apparent magnitude (V) | 5.757[2] |
| Characteristics | |
| Spectral type | K3 III[3] |
| B−V color index | 1.203[2] |
| Astrometry | |
| Radial velocity (Rv) | 0.72[2] km/s |
| Proper motion (μ) | RA: +60.568[1] mas/yr Dec.: +5.812[1] mas/yr |
| Parallax (π) | 7.8492 ± 0.1017 mas[1] |
| Distance | 416 ± 5 ly (127 ± 2 pc) |
| Absolute magnitude (MV) | 0.26[4] |
| Details | |
| Mass | 1.83[2] M☉ |
| Radius | 15.85±0.99[5] R☉ |
| Luminosity | 107.95±1.69[1] L☉ |
| Surface gravity (log g) | 2.3[5] cgs |
| Temperature | 4,560+92 −86[1] K |
| Metallicity [Fe/H] | −0.07[5] dex |
| Rotational velocity (v sin i) | 1.0[6] km/s |
| Age | 2.36[2] Gyr |
| Other designations | |
8 Per, BD+57°535, FK5 2157, HD 13982, HIP 10718, HR 661, SAO 23143[7] | |
| Database references | |
| SIMBAD | data |
8 Persei is a single[8] star in the northern constellationofPerseus,[7] located 416 light years away from the Sun.[1] It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.757.[2] There is an estimated 52% chance that the star may be a member of the Hyades–Pleiades stream of co-moving stars.[9]
With an age of over two billion years,[2] this is an aging red giant of spectral type K3 III,[3] a star that has used up its core hydrogen and is expanding. It has 1.83[2] times the mass of the Sun and has reached nearly 16[5] times the Sun's size. The star is radiating 108[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,560 K.[1]
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