Atria (Alpha Trianguli Australis)


Photo: ESO Online Digitized Sky Survey.

Atria (Alpha Trianguli Australis) is a giant K star and the brightest star in the constellation Triangulum Australe. There are indications of strong flare activity on its surface, and a small and faint binary companion has recently been detected.


visual magnitude 1.91
absolute magnitude -3.62
spectral type K2IIb-IIIa
luminosity 2,000 Lsun
distance 420 light-years (130 pc)
position R.A. 16h 48m 39.9s,
Dec. -69° 1' 40"
other designations HR 6217, CD -68°2822,
HD 150798, SAO 253700,
FK5 625, GC 22558,
HIP 82273