  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 01h 53m 17.34441s[1] |
| Declination | +40° 43′ 47.2538″[1] |
| Apparent magnitude (V) | 5.42[2] |
| Characteristics | |
| Spectral type | K1 III[3] |
| U−Bcolor index | +1.41[4] |
| B−Vcolor index | +1.32[4] |
| Astrometry | |
| Radial velocity (Rv) | −7.59±0.2[5] km/s |
| Proper motion (μ) | RA: −10.073[1]mas/yr Dec.: −4.483[1]mas/yr |
| Parallax (π) | 4.4619±0.1001 mas[1] |
| Distance | 730 ± 20 ly (224 ± 5 pc) |
| Absolute magnitude (MV) | −1.00[2] |
| Details | |
| Luminosity | 436.43[2] L☉ |
| Surface gravity (log g) | 2.30[3] cgs |
| Temperature | 4,290[3] K |
| Metallicity[Fe/H] | −0.14[3] dex |
| Other designations | |
| 55 And,BD+40°394,FK5 2124,HD 11428,HIP 8814,HR 543,SAO 37587,PPM 44535,WDS J01533+4044A[6] | |
| Database references | |
| SIMBAD | data |
55 Andromedae, abbreviated55 And, is a single,[7] orange-huedstar in the northernconstellation ofAndromeda.55 Andromedae is theFlamsteed designation. It is visible to the naked eye with anapparent visual magnitude of 5.42.[2] Based upon an annualparallax shift of4.7 mas,[1] it is located about 730 light years from theSun. 55 And is moving closer to the Earth with a heliocentricradial velocity of −7.6 km/s.[5] It is a member of theSirius supercluster.[8]
This is an aginggiant star with astellar classification of K1 III,[3] which indicates it has exhausted the hydrogen supply at its core andevolved away from themain sequence. It is radiating 436[2] times theSun's luminosity from its enlargedphotosphere at aneffective temperature of 4,290 K.[3] It has a magnitude 10.90 visual companion at anangular separation of59.00″ along aposition angle of 357° from 55 And. In 1828, this separation was just20.0″.[9]
