10 Trianguli
Star in the constellation Triangulum
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10 Trianguli (HD 14252; HR 675; 1 H. Trianguli Minus), or simply 10 Tri is a solitary star[17] located in the northern constellation Triangulum. It is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.29.[2] Gaia DR3 parallax measurements imply a distance of 363 light-years [1] and it is slowly receding with a heliocentric radial velocity of 0.4 km/s.[7] At its current distance, 10 Tri's brightness is diminished by an interstellar extinction of 0.11 magnitudes[18] and it has an absolute magnitude of −0.02.[8]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Triangulum |
| Right ascension | 02h 18m 56.99355s[1] |
| Declination | +28° 38′ 33.6322″[1] |
| Apparent magnitude (V) | 5.29±0.01[2] |
| Characteristics | |
| Evolutionary stage | main sequence star[3] |
| Spectral type | A2 V[4][5] |
| U−B color index | +0.02[6] |
| B−V color index | +0.04[6] |
| Astrometry | |
| Radial velocity (Rv) | 0.4±0.1[7] km/s |
| Proper motion (μ) | RA: +7.073 mas/yr[1] Dec.: +0.836 mas/yr[1] |
| Parallax (π) | 8.9971±0.0729 mas[1] |
| Distance | 363 ± 3 ly (111.1 ± 0.9 pc) |
| Absolute magnitude (MV) | −0.02[8] |
| Details | |
| Mass | 2.83±0.05[3] M☉ |
| Radius | 3.71±0.19[9] R☉ |
| Luminosity | 108+10 −9[3] L☉ |
| Surface gravity (log g) | 3.73[10] cgs |
| Temperature | 9,023[11] K |
| Metallicity [Fe/H] | +0.33[12] dex |
| Rotational velocity (v sin i) | 22±2[13] km/s |
| Age | 372±44[14][15] Myr |
| Other designations | |
| 1 H. Trianguli Minus,[16] 10 Tri, AG+28° 262, BD+27°360, GC 2781, HD 14252, HIP 10793, HR 675, SAO 75276 | |
| Database references | |
| SIMBAD | data |
10 Trianguli has a stellar classification of A2 V,[4][5] indicating that it is an ordinary A-type main-sequence star that is generating energy via hydrogen fusion at its core. It has 2.83 times the mass of the Sun[3] and a slightly enlarged radius 3.71 times that of the Sun.[9] It radiates 108 times the luminosity of the Sun[3] from its photosphere at an effective temperature of 9,023 K.[11] 10 Trianguli is rather evolved for its class, having completed 92.5% of its main sequence lifetime[3] at the age of 372 million years.[14][15] It is metal enriched with an iron abundance of [Fe/H] = +0.33 or % of the Sun's[12] and unlike most hot stars, it spins modestly with a projected rotational velocity of 22 km/s.[13]
10 Trianguli has a 13th magnitude companion located 58.3" away along a position angle of 205°.[19] It is an unrelated background star that is much more distant than 10 Trianguli.[20] Together with ι Trianguli and 12 Trianguli, it forms part of the obsolete Triangulum Minus.
It was once designated a Trianguli by John Flamsteed and was included in his Atlas Coelestis, but the designation is now dropped.[21]