4 Andromedae
4 Andromedae, abbreviated 4 And, is a single star in the northern constellation of Andromeda. 4 Andromedae is the Flamsteed designation. It is dimly visible to the naked eye with an apparent visual magnitude of 5.308. Based upon an annual parallax shift of 9.7 mas as seen from Earth's orbit, it is located 337 light years away. The star is moving closer with a heliocentric radial velocity of −11 km/s. It has a magnitude 11.7 visual companion at an angular separation of 51.10″ along a position angle of 348°, as of 2002.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 23h 07m 39.26682s |
| Declination | +46° 23′ 14.0325″ |
| Apparent magnitude (V) | 5.308 |
| Characteristics | |
| Spectral type | K5 III |
| B−V color index | 1.436 |
| Astrometry | |
| Radial velocity (Rv) | −11.3±0.3 km/s |
| Proper motion (μ) | RA: −12.460 mas/yr Dec.: −30.172 mas/yr |
| Parallax (π) | 9.6771 ± 0.1143 mas |
| Distance | 337 ± 4 ly (103 ± 1 pc) |
| Details | |
| Mass | 1.58±0.44 M☉ |
| Radius | 25.9 R☉ |
| Luminosity | 170 L☉ |
| Surface gravity (log g) | 1.91 cgs |
| Temperature | 4,275±92 K |
| Metallicity [Fe/H] | 1.98±0.11 dex |
| Age | 2.24+0.78 −0.58 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
At the age of 2.2 billion years, this is an aging giant star with a stellar classification of K5 III, having consumed the hydrogen at its core and evolved away from the main sequence. It has 1.6 times the mass of the Sun and has expanded to 26 times the Sun's radius. The star is radiating 170 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,275 K.