5 Trianguli

5 Trianguli is a solitary star located in the northern constellation Triangulum. With an apparent magnitude of 6.23,^[2] it’s barely visible to the naked eye under ideal conditions. The star is located 399 light years^[1] away from the Solar System, but is drifting away with a radial velocity of 7.7 km/s.^[5]

5 Trianguli

Location of 5 Trianguli (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Triangulum
Right ascension	02h 11m 25.02s[1]
Declination	+31° 31′ 35.02″[1]
Apparent magnitude (V)	6.23±0.01[2]
Characteristics
Spectral type	A0 Vm[3]
U−B color index	+0.11[4]
B−V color index	+0.12[4]
Astrometry
Radial velocity (Rv)	7.7±1.5[5] km/s
Proper motion (μ)	RA: +35.429[1] mas/yr Dec.: −10.785[1] mas/yr
Parallax (π)	8.1779±0.0862 mas[1]
Distance	399 ± 4 ly (122 ± 1 pc)
Absolute magnitude (MV)	+1.07[6]
Details[7]
Mass	2.22±0.41 M☉
Radius	2.96±0.36 R☉
Luminosity	48.2±1.2 L☉
Surface gravity (log g)	3.84±0.31 cgs
Temperature	8,836 K
Metallicity [Fe/H]	−0.17[8] dex
Rotational velocity (v sin i)	15±10[9] km/s
Other designations
5 Trianguli, BD+30 347, HD 13372, HIP 10220, HR 634, SAO 55338
Database references
SIMBAD	data

5 Trianguli has a classification of A0 Vm,^[3] which states it’s an A-type main-sequence star with unusually strong metallic lines. It has 2.22 times the mass of the Sun and 2.96 times the radius of the Sun. 5 Trianguli radiates at 48 solar luminosities from its photosphere at an effective temperature of 8,836 kelvin, which gives it a white-hue of an A-type star.^[7] It has a low projected rotational velocity of 15 km/s, common for Am stars.^[9]