β Trianguli Australis

Beta Trianguli Australis forms the apex of the equilateral Southern Triangle: binoculars.

Betweem delta and beta, directly north 3, is the splendid open cluster NGC 6025, well-seen in binoculars. The thirty or so members are seventh-magnitude or fainter.

Southeast of beta less than a degree is S TrA, with a distinctive copper tint. This Cepheid varies from 6.1 to 6.7 every 6.3 days.

In the same field is iota TrA, a binary (DUN 201): 5.3, 9.4; 1, 16.7".


A little over a binocular field southwest is gamma TrA.

This field has the Cepheid variable R TrA which fluctuates from 6.0 to 6.8 every 3.4 days. It's less than three degrees north of gamma TrA.

Epsilon TrA is a wide binary (DUN 188): 4.2, 9.4; 220, 81.9".

A second binary here, Rmk 20, is much closer, AB: 6.2, 6.4; 147, 1.8".

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1999-2014 by Richard Dibon-Smith.