Alpha Trianguli Australis
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| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Triangulum Australe |
| Right ascension | 16h 48m 39.9s |
| Declination | -69° 01′ 40″ |
| Apparent magnitude (V) | 1.91 |
| Characteristics | |
| Spectral type | K2 IIb-IIIa |
| U-B color index | 0.32 |
| B-V color index | 1.45 |
| Variable type | ? |
| Astrometry | |
| Radial velocity (Rv) | -3 km/s |
| Proper motion (μ) | RA: 17.85 mas/yr Dec.: -32.92 mas/yr |
| Parallax (π) | 7.85 ± 0.63 mas |
| Distance | 420 ± 30 ly (130 ± 10 pc) |
| Absolute magnitude (MV) | -3.62 |
| Other designations | |
| Database references | |
| SIMBAD | data |
Alpha Trianguli Australis (α TrA / α Trianguli Australis) is a star in the constellation Triangulum Australe. It also has the traditional name Atria, a contraction of its Bayer designation, "Alpha Trianguli Australis".
Alpha Trianguli Australis is an orange K-type bright giant with an apparent magnitude of +1.91. It is approximately 415 light years from Earth. There is evidence, though not watertight, that Atria may be a double star.
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