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Atria

Alpha Trianguli Australis

Orange Star in Triangulum Australe

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Proper Name	Atria
Bayer Designation	Alpha Trianguli Australis
Flamsteed Number	None
HR (BSC)	6217
HD	150798
Constellation	Triangulum Australe
Right Ascension	16h 48m 40s
Declination	-69° 1' 40"
Distance	391 light years 120 parsecs
Magnitude	Apparent: +1.9 Absolute: -3.62
Spectral Class	K2 Orange Giant
Optimum Visibility	June (Usually visible from southern latitudes)
Notes	Though 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.

Imagery provided by Aladin sky atlas

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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