The Constellation Triangulum Australe
by Dominic Ford
The constellation Triangulum Australe.
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Source: Stellarium.
Source: Stellarium.
Triangulum Australe is a small constellation which lies close to the south celestial pole. Across much of the southern hemisphere it is circumpolar, but it appears highest in the evening sky in the months around April.
It is the southern counterpart of Triangulum, and is of a similar size. It was introduced by Keyser & de Houtman in 1598. Comprising of one second-magnitude and two third-magnitude stars, it is a full magnitude brighter than the northern triangle.
The southern triangle is home to only one bright deep sky object, the open cluster NGC 6025, also known as Caldwell 95.
Date First Appeared
1598 (Keyser & de Houtman)
1598 (Keyser & de Houtman)
Sky Area
0.3% of the sky
110.0 square degrees
0.3% of the sky
110.0 square degrees
Messier Objects
Triangulum Australe contains no Messier objects
Triangulum Australe contains no Messier objects
| Stars | Open Clusters | Globular Clusters | Galaxies |
| Stars | Open Clusters | Globular Clusters | Galaxies |
| Atria (mag 1.9) | NGC 6025 (mag 5.1) | NGC 5938 (mag 11.9) | |
| β-TrA (mag 2.8) | NGC 6156 (mag 12.3) | ||
| γ-TrA (mag 2.8) | IC 4585 (mag 13.0) | ||
| δ-TrA (mag 3.8) | IC 4595 (mag 13.1) | ||
| ε-TrA (mag 4.1) | IC 4584 (mag 13.4) | ||
| ζ-TrA (mag 4.9) | NGC 6183 (mag 14.1) | ||
| LP TrA (mag 5.1) | IC 4571 (mag 14.6) | ||
| κ-TrA (mag 5.1) | |||
| HD 148291 (mag 5.2) | |||
| ι-TrA (mag 5.3) | |||
| θ-TrA (mag 5.5) | |||
| X TrA (mag 5.6) | |||
| HD 137066 (mag 5.7) | |||
| HD 142514 (mag 5.7) | |||
| HD 142139 (mag 5.8) | |||
| HD 133683 (mag 5.8) | |||
| HD 152564 (mag 5.9) | |||
| η¹-TrA (mag 5.9) | |||
| HD 136672 (mag 5.9) | |||
| HD 145689 (mag 5.9) | |||
| HD 150026 (mag 6.0) | |||
| HD 151441 (mag 6.1) | |||
| HD 147349 (mag 6.1) | |||
| HD 140483 (mag 6.1) | |||
| HD 133456 (mag 6.2) |