11 Lacertae is a star in the northern constellation of Lacerta. It is visible to the naked eye as a faint orange-hued star with an apparent visual magnitude of 4.46.[3] It lies at a distance of about 333[2] light years and has an absolute magnitude -0.54.[6] The object is moving closer to the Earth with a heliocentric radial velocity of −10.9 km/s.[5]

11 Lacertae

11 Lacertae in optical light
Observation data Epoch J2000      Equinox J2000
Constellation	Lacerta[1]
Right ascension	22h 40m 30.85881s[2]
Declination	+44° 16′ 34.7042″[2]
Apparent magnitude (V)	4.46[3]
Characteristics
Spectral type	K2.5 III[4]
U−B color index	+1.36[3]
B−V color index	+1.33[3]
Astrometry
Radial velocity (Rv)	−10.91±0.09[5] km/s
Proper motion (μ)	RA: +94.426[2] mas/yr Dec.: +11.606[2] mas/yr
Parallax (π)	9.80 ± 0.26 mas[2]
Distance	333 ± 9 ly (102 ± 3 pc)
Absolute magnitude (MV)	−0.54[6]
Details[7]
Mass	1.38 M☉
Radius	27.70 R☉
Luminosity	204 L☉
Surface gravity (log g)	1.93[8] cgs
Temperature	4,352[8] K
Metallicity [Fe/H]	−0.19[8] dex
Rotational velocity (v sin i)	8[9] km/s
Age	3.2 Gyr
Other designations
11 Lac, BD+43° 4266, HD 214868, HIP 111944, HR 8632, SAO 52251[10]
Database references
SIMBAD	data

This is an evolved giant star with a stellar classification of K2.5 III.[4] It is a red clump giant, meaning it is fusing helium in its core after passing through the red giant branch.[7] The star is 3.2 billion years old with 1.38 times the mass of the Sun and has expanded to 27.7 times the Sun's radius.[7] It is radiating 204[7] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,352 K.[8]

References