Magnitude 5.89 Apparent magnitude (V) 5.89 | Constellation Triangulum Australe | |
People also search for Epsilon Trianguli Australis | ||
Eta Trianguli Australis (η TrA, η Trianguli Australis) is a star in the constellation Triangulum Australe. It is sometimes given a superscript: η¹ Trianguli Australis, though it is the only star that is commonly referred to by this Bayer designation.
Eta Trianguli Australis is a blue-white B-type subgiant with an apparent magnitude of +5.89. It is approximately 661 light years (203 parsecs) from Earth. Lacaille named a close by star as Eta as well, which was inconsistently followed by Francis Baily, who used the name for the brighter or both stars in two different publications. Despite their faintness, Gould upheld their Bayer designation as they were closer than 25 degrees to the south celestial pole. The second Eta is now designated as HD 150550. It is a variable star of average magnitude 6.53 and spectral type A1III.