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Proper NameAtria
Bayer DesignationAlpha Trianguli Australis
Flamsteed NumberNone
HR (BSC)6217
HD150798
ConstellationTriangulum Australe
Right Ascension16h 48m 40s
Declination-69° 01' 40"
Distance391 light years
120 parsecs
MagnitudeApparent: +1.9
Absolute: -3.62
Spectral ClassK2 Orange Giant
Optimum VisibilityMay/June
NotesThough only about seven times the mass of the Sun, giant Atria emits more than 2,000 times as much light. It is believed to have a yellow dwarf companion somewhat similar to the Sun, whose interactions with its giant primary star result in frequent flare activity.

A huge orange star, nearly 400 light years from the Solar System. It is the brightest star in the constellation of the Southern Triangle. Its name Atria is presumably derived from a contraction of its Bayer desigation: Alpha Trianguli Australis.

Atria is a highly luminous body, though as an orange, K-type, star its surface temperature is a little lower than that of the Sun. There are indications of strong flare activity on its surface, and a small and faint binary companion has recently been detected.

Its high intrinsic luminosity means that Atria shines brightly in Earth's sky: a magnitude of +1.9 makes it the thirty-second brightest star, and considerably more prominent than its counterpart in the Northern Triangle, Mothallah.

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