X Trianguli Australis is a star in the southern constellation Triangulum Australe.

It is a red-hued carbon star approximately 1,140 light years (350 parsecs) from Earth.

[2] It is a semi-regular variable star with two periods of around 385 and 455 days, and is of spectral type C5.5(Nb).

It is a cool star, with of a surface effective temperature of 2,650 K (2,380 °C), yet luminous, emitting 13,000 times the luminosity of the Sun.

[7][a] If placed at the center of the Solar System, it would stretch out farther than Mars' orbit.