Gamma Trianguli Australis
 Location of γ Trianguli Australis (circled) |
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| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| Constellation | Triangulum Australe |
| Right ascension | 15h 18m 54.58198s |
| Declination | –68° 40′ 46.3654″ |
| Apparent magnitude (V) | +2.87 |
| Characteristics | |
| Spectral type | A1 V |
| U−B color index | –0.02 |
| B−V color index | +0.00 |
| Astrometry | |
| Radial velocity (Rv) | –3.0 km/s |
| Proper motion (μ) |
RA: –66.58 mas/yr Dec.: –32.31 mas/yr |
| Parallax (π) | 17.74 ± 0.12mas |
| Distance | 184 ± 1 ly (56.4 ± 0.4 pc) |
| Details | |
| Radius | 5.86 R☉ |
| Temperature | 9,400 K |
| Rotational velocity (v sin i) | 199 km/s |
| Age | 260 Myr |
| Other designations | |
Gamma Trianguli Australis (γ TrA, γ Trianguli Australis) is a star in the constellation Triangulum Australe. Along with Alpha and Beta Trianguli Australis it forms a prominent triangular asterism that gives the constellation its name (Latin for southern triangle). It is the third-brightest member of this constellation with an apparent visual magnitude of +2.87. based upon parallax measurements, Gamma Trianguli Australis is located at a distance of about 184 light-years (56 parsecs) from Earth.
The spectrum of this star matches a stellar classification of A1 V, which identifies it as an A-type main sequence star that is generating energy through the nuclear fusion of hydrogen at its core. An unusual abundance of the element europium demonstrates it to be a peculiar, or Ap star. Most stars of this type are slow rotators, but Gamma Trianguli Australis displays a very high rate of rotation with a projected rotational velocity of 199 km s−1. It has an estimated age of 260 million years.
This system shows an excess emission of infrared radiation, suggesting that there is a circumstellar disk of dust orbiting this star. The mean temperature of the emission is 50 K, corresponding to a separation from the star of 481 astronomical units.
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