12 Trianguli
Star in the constellation Triangulum
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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]
 | |
| 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 |
It was once designated c Trianguli by John Flamsteed and was included in his Atlas Coelestis, but the designation is now dropped.[11]
Together with ι Trianguli and 10 Trianguli, it forms part of the obsolete Triangulum Minus.