11 Trianguli

11 Trianguli is a solitary^[12] star located in the northern constellation Triangulum, with an apparent magnitude of 5.55. The star is situated 281 light years^[1] away but is approaching with a heliocentric radial velocity of −41.614 km/s.^[6] It is probably on the horizontal branch fusing helium in its core,^[3] and is calculated to be about 6.3 Gyr old.^[3] It has a stellar classification of K1 III.^[4][5] It has 2.446 times the mass of the Sun and 12.055 times the radius of the Sun.^[8] It shines at 54.6 times the luminosity of the Sun^[9] from its photosphere at an effective temperature of 4,572 K.^[10]

11 Trianguli

Location of 11 Trianguli (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Triangulum
Right ascension	02h 27m 27.771s[1]
Declination	+31° 48′ 04.61″[1]
Apparent magnitude (V)	5.55[2]
Characteristics
Evolutionary stage	horizontal branch[3]
Spectral type	K1 III[4][5]
B−V color index	+1.1[2]
Astrometry
Radial velocity (Rv)	−41.614±0.163[6] km/s
Proper motion (μ)	RA: −24.331[1] mas/yr Dec.: −27.845[1] mas/yr
Parallax (π)	11.6240±0.1293 mas[1]
Distance	281 ± 3 ly (86.0 ± 1.0 pc)
Absolute magnitude (MV)	0.836[7]
Details
Mass	2.446±0.122[8] M☉
Radius	12.055±0.603[8] R☉
Luminosity	54.6±3.8[9] L☉
Surface gravity (log g)	2.2[10] cgs
Temperature	4,572[10] K
Metallicity [Fe/H]	−0.19[7][11] dex
Age	6.3+2.8 −1.4[3] Gyr
Other designations
11 Trianguli, AG+31° 231, BD+31°427, GC 2943, HD 15176, HIP 11432, HR 712, SAO 55570
Database references
SIMBAD	data