Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda |
Right ascension | 23h 07m 39.26682s[1] |
Declination | +46° 23′ 14.0325″[1] |
Apparent magnitude (V) | 5.308[2] |
Characteristics | |
Spectral type | K5 III[3] |
B−V color index | 1.436[2] |
Astrometry | |
Radial velocity (Rv) | −11.3±0.3[4] km/s |
Proper motion (μ) | RA: −12.460[1] mas/yr Dec.: −30.172[1] mas/yr |
Parallax (π) | 9.6771 ± 0.1143 mas[1] |
Distance | 337 ± 4 ly (103 ± 1 pc) |
Details | |
Mass | 1.58±0.44[5] M☉ |
Radius | 25.9[6] R☉ |
Luminosity | 170[6] L☉ |
Surface gravity (log g) | 1.91[2] cgs |
Temperature | 4,275±92[5] K |
Metallicity [Fe/H] | 1.98±0.11[5] dex |
Age | 2.24+0.78 −0.58[5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
4 Andromedae, abbreviated 4 And, is a single[8] 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.[2] Based upon an annual parallax shift of 9.7 mas[1] 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.[4] It has a magnitude 11.7 visual companion at an angular separation of 51.10″ along a position angle of 348°, as of 2002.[9]
At the age of 2.2[5] billion years, this is an aging giant star with a stellar classification of K5 III,[3] having consumed the hydrogen at its core and evolved away from the main sequence. It has 1.6[5] times the mass of the Sun and has expanded to 26[6] times the Sun's radius. The star is radiating 170[6] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,275 K.[5]