Triangulum Australe: A small constellation in the southern sky, named after the triangle formed by its three brightest stars: Atria, Beta and Gamma Trianguli Australis.
History: The constellation was first depicted by Petrus Plancius in 1589, and later named by Johann Bayer in 1603. It was also associated with various instruments by Nicolas Louis de Lacaille and other cultures by Amerigo Vespucci and Philippus Caesius.
Stars: The constellation contains several stars of different types and magnitudes, including orange giants, white main sequence stars, cepheid variables, carbon stars, and spectroscopic binaries. Some of them have exoplanets orbiting them.
Deep-sky objects: The constellation has few notable deep-sky objects, such as the open cluster NGC 6025, the planetary nebulae NGC 5979 and Henize 2-138, and the merging galaxies ESO 69-6.
Symbolism: The constellation appears on the flag of Brazil, representing the South Region.
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