23 Andromedae
Star in the constellation Andromeda
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23 Andromedae, abbreviated 23 And, is a presumed single[10] star in the constellation Andromeda, although it has been a suspected spectroscopic binary.[11] 23 Andromedae is the Flamsteed designation. Its apparent visual magnitude is 5.71,[1] which indicates it is dimly visible to the naked eye under good viewing conditions. The distance to 23 And, as determined from its annual parallax shift of 26.9 mas,[2] is 121.4 light-years. The star is moving further from the Earth with a heliocentric radial velocity of −27 km/s.[4] It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.191″ per year.[12]
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Andromeda[1] |
| Right ascension | 00h 13m 30.83999s[2] |
| Declination | +41° 02′ 07.3358″[2] |
| Apparent magnitude (V) | 5.71[1] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | F0 IV[3] |
| B−V color index | +0.331±0.004[1] |
| Astrometry | |
| Radial velocity (Rv) | −27.1±1.2[4] km/s |
| Proper motion (μ) | RA: −123.558[2] mas/yr Dec.: −146.479[2] mas/yr |
| Parallax (π) | 26.8715±0.0403 mas[2] |
| Distance | 121.4 ± 0.2 ly (37.21 ± 0.06 pc) |
| Absolute magnitude (MV) | +3.01[5] |
| Details | |
| Mass | 1.51[6] M☉ |
| Radius | 1.66[6] R☉ |
| Luminosity | 5.7[6] L☉ |
| Surface gravity (log g) | 4.17[6] cgs |
| Temperature | 6,921[6] K |
| Metallicity [Fe/H] | −0.13±0.07[7] dex |
| Rotational velocity (v sin i) | 36[3] km/s |
| Age | 2.2[8] Gyr |
| Other designations | |
| 23 And, BD+40°29, FK5 2010, HD 905, HIP 1086, HR 41, SAO 36173, PPM 42707[9] | |
| Database references | |
| SIMBAD | data |
The stellar classification of 23 And is F0 IV,[3] matching an F-type subgiant star that is in the process of evolving into a red giant. It displays a slight microvariability with a frequency of 0.85784 d−1 and an amplitude of 0.0062 magnitude.[13] The star is around 2.2 billion years old[8] with a projected rotational velocity of 36 km/s.[3] It has 1.51 times the mass of the Sun and is radiating 5.7 times the Sun's luminosity from its photosphere at an effective temperature of 6,921 K.[6]