Magnitude 5.28 Apparent magnitude (V) 5.28 | Constellation Triangulum Australe | |
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Iota Trianguli Australis (ι TrA, ι Trianguli Australis) is a triple star system in the constellation Triangulum Australe. It is approximately 132 light years from Earth.
It shows itself to be composed of a yellow and a white star when seen though a 7.5 cm telescope.
The primary component, Iota Trianguli Australis A, is a spectroscopic binary with a mean apparent magnitude of +5.28. Both components of the binary star are yellow-white F-type stars and they have an orbital period of 39.8 days. One of the components of the binary is also classified as a Gamma Doradus type variable star, and the binary's brightness varies by 0.12 magnitudes over a period of 1.45 days. The third component of the star system, Iota Trianguli Australis B, is a 10th magnitude star, 20 arcseconds away from the primary.