11 Trianguli
Star in the constellation Triangulum
From Wikipedia, the free encyclopedia
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]
 | |
| 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 |
It was once designated d Trianguli by John Flamsteed and was included in his Atlas Coelestis, but the designation is now dropped.[13]