3 Andromedae, abbreviated 3 And, is a single[11] star in the northern constellation of Andromeda. 3 Andromedae is the Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 4.64.[2] The distance to this star, as determined from an annual parallax shift of 18 mas,[1] is 181 light years. It is moving closer to the Earth with a heliocentric radial velocity of −35 km/s,[5] and has a relatively large proper motion, traversing the celestial sphere at 0.236″·yr−1.[12]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda |
Right ascension | 23h 04m 10.98185s[1] |
Declination | +50° 03′ 07.5297″[1] |
Apparent magnitude (V) | 4.64[2] |
Characteristics | |
Evolutionary stage | giant[3] |
Spectral type | K0 IIIb[4] |
B−V color index | 1.058±0.003[2] |
Astrometry | |
Radial velocity (Rv) | −34.7±0.3[5] km/s |
Proper motion (μ) | RA: 166.374[1] mas/yr Dec.: 167.463[1] mas/yr |
Parallax (π) | 17.9785 ± 0.1522 mas[1] |
Distance | 181 ± 2 ly (55.6 ± 0.5 pc) |
Absolute magnitude (MV) | 0.97[2] |
Details | |
Mass | 1.71[6] M☉ |
Radius | 10[7] R☉ |
Luminosity | 49[6] L☉ |
Surface gravity (log g) | 2.61±0.11[8] cgs |
Temperature | 4,668±45[6] K |
Metallicity [Fe/H] | −0.08[3] dex |
Rotational velocity (v sin i) | 1.0[9] km/s |
Age | 2.27[6] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
This is an evolved giant star with a stellar classification of K0 IIIb,[4] where the 'b' suffix indicated a lower luminosity giant. It is a red clump star,[3] which means it is generating energy through helium fusion at its core. This star has an estimated 1.7[6] times the mass of the Sun (M☉), and, at the age of 2.3[6] billion years, has expanded to 10 times the Sun's radius (R☉).[7] It is radiating 49[6] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,668 K.[6]