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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"
Distance416 light years
127 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, more than 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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