23 Andromedae

23 Andromedae, abbreviated 23 And, is a presumed single^[9] star in the constellation Andromeda, although it has been a suspected spectroscopic binary.^[10] 23 Andromedae is the Flamsteed designation. Its apparent visual magnitude is 5.71,^[2] 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 26.8 mas,^[1] is 121.6 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.^[11]

23 Andromedae

Location of 23 Andromedae (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Andromeda
Right ascension	00h 13m 30.83962s[1]
Declination	+41° 02′ 07.3315″[1]
Apparent magnitude (V)	5.71[2]
Characteristics
Spectral type	F0 IV[3]
B−V color index	+0.331±0.004[2]
Astrometry
Radial velocity (Rv)	−27.1±1.2[4] km/s
Proper motion (μ)	RA: −123.289[1] mas/yr Dec.: −146.201[1] mas/yr
Parallax (π)	26.8161±0.0858 mas[1]
Distance	121.6 ± 0.4 ly (37.3 ± 0.1 pc)
Absolute magnitude (MV)	+3.01[5]
Details
Mass	1.43[6] M☉
Luminosity	49.9+5.5 −4.9[3] L☉
Surface gravity (log g)	4.25[6] cgs
Temperature	7,089±241[6] K
Metallicity [Fe/H]	−0.13±0.07[7] dex
Rotational velocity (v sin i)	36[3] km/s
Age	759[6] Myr
Other designations
23 And, BD+40°29, FK5 2010, HD 905, HIP 1086, HR 41, SAO 36173, PPM 42707[8]
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.^[12] The star is around 759^[6] million years old with a projected rotational velocity of 36 km/s.^[3] It has 1.43^[6] times the mass of the Sun and is radiating 50^[3] times the Sun's luminosity from its photosphere at an effective temperature of 7,089 K.^[6]