12 Trianguli

12 Trianguli is a solitary^[10] star located in the northern constellation Triangulum, with an apparent magnitude of 5.37,^[2] making it faintly visible to the naked eye under ideal conditions. The star is situated 160 light years^[1] away but is approaching with a heliocentric radial velocity of −24.8 km/s.^[7][6] It is calculated to be about 2.19 Gyr old^[6] with a stellar classification of F0 III,^[3][4][5][6] making it an F-type giant. It has 1.6 times the mass of the Sun^[2] and shines at 14 times the luminosity of the Sun^[2] from its photosphere at an effective temperature of 7,199 K.^[2]

12 Trianguli

Location of 12 Trianguli (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Triangulum
Right ascension	02h 28m 09.980s[1]
Declination	+29° 40′ 09.59″[1]
Apparent magnitude (V)	5.37[2]
Characteristics
Spectral type	F0 III[3][4][5][6]
B−V color index	+0.29[6]
Astrometry
Radial velocity (Rv)	−24.8±2.8[7][6] km/s
Proper motion (μ)	RA: −15.632[1] mas/yr Dec.: −86.097[1] mas/yr
Parallax (π)	20.4105 ± 0.0942 mas[1]
Distance	159.8 ± 0.7 ly (49.0 ± 0.2 pc)
Details
Mass	1.6[2] M☉
Luminosity	14[2] L☉
Surface gravity (log g)	3.79[6] cgs
Temperature	7,199[2] K
Metallicity [Fe/H]	0.27[5] dex
Rotational velocity (v sin i)	85[8][9] km/s
Age	2.19[6] Gyr
Other designations
12 Trianguli, AG+29°296, BD+29°417, GC 2956, HD 15257, HIP 11486, HR 717, SAO 75382
Database references
SIMBAD	data

Together with ι Trianguli and 10 Trianguli, it forms part of the obsolete Triangulum Minus.