11 Andromedae

Not to be confused with Xi Andromedae or Andromeda II. For the galaxy Andromeda XI (Andromeda 11), see Andromeda XI.

11 Andromedae, abbreviated 11 And, is a single,^[10] orange-hued star in the northern constellation of Andromeda. 11 Andromedae is the Flamsteed designation. It has an apparent visual magnitude of 5.44,^[2] which is bright enough to be faintly visible to the naked eye. An annual parallax shift of 11.5 mas^[1] yields a distance estimate of 283 light years. It is moving further from the Earth with a heliocentric radial velocity of +10 km/s.^[1]

11 Andromedae

Location of 11 Andromedae (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Andromeda
Right ascension	23h 19m 29.80701s[1]
Declination	+48° 37′ 31.1615″[1]
Apparent magnitude (V)	5.44[2]
Characteristics
Spectral type	K0 III[3]
U−B color index	+0.82[4]
B−V color index	+1.014±0.003[2]
Astrometry
Radial velocity (Rv)	+9.99±0.14[1] km/s
Proper motion (μ)	RA: +22.597[1] mas/yr Dec.: +52.689[1] mas/yr
Parallax (π)	11.5097±0.0858 mas[1]
Distance	283 ± 2 ly (86.9 ± 0.6 pc)
Absolute magnitude (MV)	0.73[2]
Details
Mass	2.57[5] M☉
Radius	12[6] R☉
Luminosity	62.86[2] L☉
Surface gravity (log g)	2.61[5] cgs
Temperature	4,874[5] K
Metallicity [Fe/H]	−0.13±0.07[7] dex
Rotational velocity (v sin i)	1.0[8] km/s
Other designations
11 And, BD+47°4110, GC 32476, HD 219945, HIP 115152, HR 8874, SAO 52907, PPM 64074[9]
Database references
SIMBAD	data

This is an evolved giant star with a stellar classification of K0 III,^[3] which means it has exhausted the supply of hydrogen at its core and turned off the main sequence. It has an estimated 2.57^[5] times the mass of the Sun and has expanded to around 12^[6] times the Sun's radius. It is radiating 63^[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,874 km/s.^[5]

Within Andromeda it is the south-west end of a bright northerly chain (jagged line) asterism – the others being, their order going with numbering, 8, 7, 5 and 3 Andromedae.