10 Trianguli

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]

10 Trianguli

Location of 10 Trianguli (circled)
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.