| Constellation | |
List of stars in Triangulum Australe |
|
| Abbreviation | TrA |
|---|---|
| Genitive | Trianguli Australis |
| Pronunciation | /traɪˈæŋɡjʊləm ɒsˈtreɪliː/, genitive /traɪˈæŋɡjʊlaɪ ɒˈstreɪlɨs/ |
| Symbolism | the Southern Triangle |
| Right ascension | 16 h |
| Declination | −65° |
| Quadrant | SQ3 |
| Area | 110 sq. deg. (83rd) |
| Main stars | 3 |
| Bayer/Flamsteed stars |
10 |
| Stars with planets | 1 |
| Stars brighter than 3.00m | 3 |
| Stars within 10.00 pc (32.62 ly) | 0 |
| Brightest star | α TrA (Atria) (1.91m) |
| Nearest star | ζ TrA (39.48 ly, 12.11 pc) |
| Messier objects | None |
| Meteor showers | None |
| Bordering constellations |
Norma Ara Circinus Apus |
| Visible at latitudes between +25° and −90°. Best visible at 21:00 (9 p.m.) during the month of July. |
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Triangulum Australe is a small constellation in the southern sky, created in the sixteenth century. Its name is Latin for 'the southern triangle', which distinguishes it from Triangulum in the northern sky. Its name derives from its three brightest stars, of second and third magnitude, which form an approximately equilateral triangle.
The invention of this constellation is obscure but can be attributed to 16th century seafarers. It was introduced in 1589 by Petrus Plancius on a 32½-cm diameter celestial globe published in Amsterdam by Jacob Floris van Langren. Triangulum Australe acquired its present form and position on a 35-cm diameter celestial globe published in 1597 (or 1598) in Amsterdam by Plancius with Jodocus Hondius. It was first depicted in a celestial atlas in the Uranometria of Johann Bayer in 1603.
Its notable features include NGC 6025, an open cluster with about 30 stars ranging from 7th to 9th magnitude.
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