Theta Trianguli Australis

θ Trianguli Australis, Latinized as Theta Trianguli Australis, is a single star in the southern constellation of Triangulum Australe. It is visible to the naked eye as a dim, yellow-hued star with an apparent visual magnitude of +5.50. The star is located about 334 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +10 km/s.

This is an evolved G/K-type giant star with a stellar classification of G8-K0 III. The interferometry-measured angular diameter of the primary component is $9.6$, which, at its estimated distance, equates to a physical radius of about 11 times the radius of the Sun. The star is radiating 79 times the Sun's luminosity from its photosphere at an effective temperature of 5,039 K.