  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 23h 07m 39.2672s[1] |
| Declination | +46° 23′ 14.030″[1] |
| Apparent magnitude (V) | 5.308[2] |
| Characteristics | |
| Evolutionary stage | Giant star |
| Spectral type | K5 III[3] |
| B−Vcolor index | 1.436[2] |
| Astrometry | |
| Radial velocity (Rv) | −11.89±0.12[1] km/s |
| Proper motion (μ) | RA: −12.734mas/yr[1] Dec.: −30.026mas/yr[1] |
| Parallax (π) | 9.155±0.0779 mas[1] |
| Distance | 356 ± 3 ly (109.2 ± 0.9 pc)[1] |
| Details | |
| Mass | 1.58±0.44[4] M☉ |
| Radius | 23.36±0.59[5] R☉ |
| Luminosity | 170[6] L☉ |
| Surface gravity (log g) | 1.91[2] cgs |
| Temperature | 4,275±92[4] K |
| Metallicity[Fe/H] | 1.98±0.11[4] dex |
| Age | 2.24+0.78 −0.58[4] Gyr |
| Other designations | |
| 4 And,BD+45°4149,FK5 3852,HD 218452,HIP 114200,HR 8804,SAO 52711,PPM 63840,WDS J23077+4623A[7] | |
| Database references | |
| SIMBAD | data |
4 Andromedae, abbreviated4 And, is a single[8]star in the northernconstellation ofAndromeda.4 Andromedae is theFlamsteed designation. It is dimly visible to the naked eye with anapparent visual magnitude of 5.308.[2] Based upon an annualparallax shift of9.16 mas[1] as seen from Earth's orbit, it is located 356 light years away. At this distance,interstellar extinction diminishes the apparent magnitude of 4 And by 0.5326magnitudes.[1] The star is moving closer with a heliocentricradial velocity of −11 km/s.[9] It has a magnitude 11.7visual companion at anangular separation of51.10″ along aposition angle of 348°, as of 2002.[10]
At the age of 2.2[4] billion years, this is an aginggiant star with astellar classification of K5 III,[3] having consumed the hydrogen at its core andevolved away from themain sequence. It has 1.6[4] times themass of the Sun and has expanded to 23[5] times theSun's radius. The star is radiating 170[6] times theSun's luminosity from its enlargedphotosphere at aneffective temperature of 4,275 K.[4]
