Generalities: it is the equivalent of the Triangle in the southern celestial hemisphere. It shows a rather bright star and it is overall brighter than its northern equivalent. Its transit at midnight takes place between May and June.

Origins and mythology: this constellation belongs to the “modern” ones. It was defined by Bayer in the seventeenth century.

Stars: the Southern Triangle has a star of average brightness, with magnitude 1.92. It is the star alpha, named Atria, of  orange color  and  55 light-years far. The other two stars that form the triangle have magnitude 2.85 and 2.89. Moreover there is  a fourth star under magnitude 4.

Table of stars brighter than magnitude 3.5
 

Star	Proper name	Magnitude	Spectrum	Colour	Distance (light-years)	Notes
Alpha	Atria	1.92	K2	orange	55
Beta		2.85	F5	white-yellow	33
Gamma		2.89	A0	white	91

Other objects: it contains a rather interesting open cluster.

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