Beta Trianguli Australis
 Location of β Trianguli Australis (circled) |
|
| 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 ± 0.16mas |
| Distance | 40.37 ± 0.08 ly (12.38 ± 0.02 pc) |
| Details | |
| Surface gravity (log g) | 4.219 ± 0.066 cgs |
| Temperature | 7,384 ± 368 K |
| Metallicity [Fe/H] | −0.29 dex |
| Rotational velocity (v sin i) | 79 km/s |
| Other designations | |
Beta Trianguli Australis (β TrA, β Trianguli Australis) is a double star in the southern circumpolar 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 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.
β TrA appears on the flag of Brazil, symbolising the state of Santa Catarina.
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