  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 03h 32m 26.25886s[1] |
| Declination | 46° 03′ 24.7029″[1] |
| Apparent magnitude (V) | 5.32[2] |
| Characteristics | |
| Spectral type | F4III[3] |
| U−Bcolor index | −0.02[2] |
| B−Vcolor index | +0.41[2] |
| Astrometry | |
| Radial velocity (Rv) | −47.5[4] km/s |
| Proper motion (μ) | RA: −52.829[1]mas/yr Dec.: −74.915[1]mas/yr |
| Parallax (π) | 26.9895±0.1053 mas[1] |
| Distance | 120.8 ± 0.5 ly (37.1 ± 0.1 pc) |
| Absolute magnitude (MV) | 2.50[5] |
| Details | |
| Mass | 1.50[4] M☉ |
| Radius | 2.28+0.13 −0.09[1] R☉ |
| Luminosity | 8.585±0.042[1] L☉ |
| Surface gravity (log g) | 3.94[4] cgs |
| Temperature | 6,546+126 −176[1] K |
| Metallicity [Fe/H] | −0.17[4] dex |
| Rotational velocity (v sin i) | 28.0[6] km/s |
| Age | 2.20[4] Gyr |
| Other designations | |
| 36 Per,NSV 1182,BD+45°778,FK5 2249,GC 4210,HD 21770,HIP 16499,HR 1069,SAO 38924[7] | |
| Database references | |
| SIMBAD | data |
36 Persei is a solitary,[8]variable star located 121 light years away from the Sun in the northernconstellation ofPerseus. It is visible to the naked eye as a dim, yellow-white hued point of light with a baselineapparent visual magnitude of 5.32.[2] The star is drifting closer to the Sun with a heliocentricradial velocity of −47.5 km/s,[4] and may come as close as 36.6 light-years in 661,000 years.[5]
Thestellar classification of 36 Persei is F4III,[3] matching an aginggiant star that has used up its corehydrogen. This object is used by astronomers as aspectral standard for stars with a similar class.[9] The star is a suspected variable of unknown type, ranging in visual magnitude from 5.29 down to 5.33,[10] and is a source ofX-ray emission.[11] The star is 2.2[4] billion years old with aprojected rotational velocity of 28 km/s.[6] It has an estimated 1.5[4] times themass of the Sun and has not yet expanded significantly, having 2.3[1] times the Sun's girth. The star is radiating 8.6[1] times theluminosity of the Sun from itsphotosphere at aneffective temperature of 6,546 [1]
