5 Trianguli
Star in the constellation Triangulum
From Wikipedia, the free encyclopedia
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]
 | |
| 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]