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7 Trianguli
Star in the constellation Triangulum / From Wikipedia, the free encyclopedia
7 Trianguli is a solitary[11] star located in the northern constellation Triangulum. It has an apparent magnitude of 5.25,[2] making it faintly visible to the naked eye under ideal conditions. The star is situated at distance of 360 light years[1] but is approaching with a heliocentric radial velocity of −1.3 km/s,[6] which is poorly constrained.
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Triangulum |
Right ascension | 02h 15m 56.2876s[1] |
Declination | +33° 21′ 32.032″[1] |
Apparent magnitude (V) | 5.25±0.01[2] |
Characteristics | |
Spectral type | A0 V[3] or B9.5 V[4] |
U−B color index | −0.03[5] |
B−V color index | −0.01[5] |
Astrometry | |
Radial velocity (Rv) | −1.3±2[6] km/s |
Proper motion (μ) | RA: −15.234[1] mas/yr Dec.: −32.711[1] mas/yr |
Parallax (π) | 9.0683 ± 0.137 mas[1] |
Distance | 360 ± 5 ly (110 ± 2 pc) |
Absolute magnitude (MV) | 0.58[7] |
Details | |
Mass | 2.77[8] M☉ |
Radius | 3.24±0.11[9] R☉ |
Luminosity | 89.1+10.5 −8.1[9] L☉ |
Surface gravity (log g) | 4.02±0.14[8] cgs |
Temperature | 10685±363[8] K |
Rotational velocity (v sin i) | 130[10] km/s |
Age | 283[8] Myr |
Other designations | |
Database references | |
SIMBAD | data |
7 Trianguli has a stellar classification of A0 V[3] or B9.5 V,[4] depending on the study. At present it has 2.77 times the mass of the Sun[8] and 3.24 times the radius of the Sun.[9] It shines at 89.1 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 10,685 K,[8] giving it a blueish white glow. 7 Trianguli is a young star, with an age of 283 million years[8] and spins rapidly with a projected rotational velocity of 130 km/s.[10] It has been classified as having a peculiar spectrum,[12] but it is considered doubtful that it is actually a chemically peculiar star.[13]
Together with δ Trianguli and γ Trianguli, it forms an optical (line-of-sight) triple.