Beta Trianguli Australis
Beta Trianguli Australis, Latinized from β Trianguli Australis, is a double star in the southern constellation of Triangulum Australe. It is approximately 40.37 light-years (12.38 parsecs) from Earth and has an apparent visual magnitude of +2.85. This star has a relatively high rate of proper motion across the celestial sphere. It is a F-type main-sequence star with a stellar classification of F1 V. Beta TrA has a 14th magnitude optical companion at an angular separation of 155 arcseconds.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Triangulum Australe |
| Right ascension | 15h 55m 08.56206s |
| Declination | −63° 25′ 50.6155″ |
| Apparent magnitude (V) | 2.85 |
| Characteristics | |
| Spectral type | F1 V |
| U−B color index | +0.05 |
| B−V color index | +0.29 |
| Astrometry | |
| Radial velocity (Rv) | +0.4 km/s |
| Proper motion (μ) | RA: −188.66 mas/yr Dec.: −401.85 mas/yr |
| Parallax (π) | 80.79 ± 0.16 mas |
| Distance | 40.37 ± 0.08 ly (12.38 ± 0.02 pc) |
| Absolute magnitude (MV) | +2.37 |
| Details | |
| Mass | 1.56 M☉ |
| Radius | 1.976±0.021 R☉ |
| Luminosity | 9.30±0.17 L☉ |
| Surface gravity (log g) | 4.219±0.066 cgs |
| Temperature | 7,171±35 K |
| Metallicity [Fe/H] | −0.29±0.10 dex |
| Rotational velocity (v sin i) | 69.63 km/s |
| Age | 674 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Observation with the Spitzer Space Telescope reveals what appears to be an excess infrared emission from this star. This suggests the presence of circumstellar material in this system, making it a debris disk candidate. This star may be a member of the Beta Pictoris moving group, an association of about 17 stars that share a common origin and a similar motion through space. If it is a member of this group, this would put the age of β TrA at about 12 million years; the same as the group itself.