13 Trianguli
13 Trianguli is the Flamsteed designation for a star in the northern constellation of Triangulum. It has an apparent visual magnitude of 5.89, so according to the Bortle scale it is faintly visible from dark suburban skies. The star is located at a distance of 103 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +41 km/s. It made a close approach to the Sun some 665,000 years ago at an estimated separation of 34.3 light-years.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Triangulum |
| Right ascension | 02h 28m 48.49449s |
| Declination | +29° 55′ 54.3286″ |
| Apparent magnitude (V) | 5.89 |
| Characteristics | |
| Spectral type | G0 V |
| U−B color index | +0.01 |
| B−V color index | +0.591±0.014 |
| Astrometry | |
| Radial velocity (Rv) | +40.8 km/s |
| Proper motion (μ) | RA: –66.071 mas/yr Dec.: +71.499 mas/yr |
| Parallax (π) | 31.7031 ± 0.1014 mas |
| Distance | 102.9 ± 0.3 ly (31.5 ± 0.1 pc) |
| Absolute magnitude (MV) | 3.45 |
| Details | |
| Mass | 1.10±0.03 M☉ |
| Radius | 1.86±0.03 R☉ |
| Luminosity | 3.72 L☉ |
| Temperature | 5,846 K |
| Metallicity [Fe/H] | −0.24 dex |
| Rotational velocity (v sin i) | 3 km/s |
| Age | 6.45 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
A stellar classification of G0 V indicates this is a main sequence star that is generating energy by fusing hydrogen into helium at its core. It has about 110% of the Sun's mass, 186% of the Sun's radius, and shines with 3.72 times the luminosity of the Sun. The stellar atmosphere has an effective temperature of 5,846 K, giving it the yellow hue of a G-type star. It appears to be older than the Sun, with an estimated age of 6.45 billion years.
In 1994, an astrometric companion was reported at an angular separation of 0.020″. However, follow-up observations reported in 2005 not only failed to recover this object but also returned a null result on a search for planetary companions. The star has been examined for an infrared excess that could indicate the presence of an orbiting debris disk, but no such excess was found.