| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 04h 08m 15.38813s[1] |
| Declination | +37° 43′ 38.9875″[1] |
| Apparent magnitude (V) | 6.07[2] |
| Characteristics | |
| Spectral type | K1 III[3] |
| B−Vcolor index | 0.943±0.003[2] |
| Astrometry | |
| Radial velocity (Rv) | −44.35±0.20[2] km/s |
| Proper motion (μ) | RA: −98.909[1]mas/yr Dec.: −195.772[1]mas/yr |
| Parallax (π) | 22.0897±0.0483 mas[1] |
| Distance | 147.7 ± 0.3 ly (45.27 ± 0.10 pc) |
| Absolute magnitude (MV) | 2.85[2] |
| Details | |
| Mass | 1.38[4] M☉ |
| Radius | 3.72+0.10 −0.09[1] R☉ |
| Luminosity | 7.95±0.03[1] L☉ |
| Surface gravity (log g) | 3.45[4] cgs |
| Temperature | 5,028+61 −70[1] K |
| Metallicity[Fe/H] | 0.02±0.04[2] dex |
| Age | 3.93[4] Gyr |
| Other designations | |
| 40 Per,BD+37°881,HD 25975,HIP 19302,HR 1277,SAO 57000[5] | |
| Database references | |
| SIMBAD | data |
49 Persei is astar in the northernconstellation ofPerseus. It is just visible to the naked eye as a dim, orange-hued star with anapparent visual magnitude of 6.09.[2] Based uponparallax measurements, this star is located around 147.7 light-years (45.27 parsecs) away from the Sun, but is drifting closer with aradial velocity of −44 km/s.[2] It has a relatively largeproper motion, traversing thecelestial sphere at a rate of0.220″·yr−1.[6]
This is an agingred giant star with astellar classification of K1III, a star that has used up itscorehydrogen and is expanding. It is a candidatehorizontal branch star, which would indicate it is past thered giant branch stage and is fusing helium at its core.[7] The star is nearly four[4] billion years old with 1.4[4] times themass of the Sun and 3.7[1] times theSun's radius. It is radiating eight[1] times theluminosity of the Sun from itsphotosphere at aneffective temperature of 5,028 K.[1]
