Beta Trianguli Australis
Beta Trianguli Australis, Latinized from β Trianguli Australis, is a star in the southern constellation of Triangulum Australe. It has an apparent visual magnitude of +2.85, making it the second-brightest star in the constellation. It is approximately from Earth and has an apparent visual magnitude of +2.85. This star has a relatively high rate of proper motion across the celestial sphere.
In the indigenous Australian Wardaman culture, this star has the name Jirradella, meaning "rainbow sign".
Characteristics
It is a F-type main-sequence star with a stellar classification of F1 V. It has 1.61 times the Sun's mass and 1.98 times the Sun's radius. It radiates 9.3 times the Sun's luminosity from its photosphere at an effective temperature of. The abundance of elements heavier than hydrogen and helium, what astronomers term metallicity, is somewhat lower than that of the Sun.Observation with the Spitzer Space Telescope reveals what appears to be an excess infrared emission from this star. This suggests the presence of circumstellar material in this system, making it a debris disk candidate. This star may be a member of the Beta Pictoris moving group, an association of about 17 stars that share a common origin and a similar motion through space. If it is a member of this group, this would put the age of β TrA at about 12 million years; the same as the group itself.
β TrA has a nearby visual companion, the magnitude 13.2 star LTT 6333. However, it is actually a background object, with a distance of 900 light-years. This star is part of the Antaeus moving group, which likely has an extragalactic origin.