Yellow giant · Triangulum Australe
θ Trianguli Australis
Also known as: θ TrA, HIP 81252
mag 5.5340 light-years
About
θ Trianguli Australis is a yellow giant of magnitude 5.5 in Triangulum Australe, about 340 light-years away.
How to find it
- θ Trianguli Australis is in the constellation Triangulum Australe.
- Best evenings: around mid-July it is highest at about 9 pm (10 pm in summer time); a month earlier, two hours later.
- Where on Earth: it is seen well, at least 10° up, from south of 15° N.
When it rises and sets tonight, how high it climbs and how much the Moon gets in the way are worked out in your browser for your place.
What you will see
- EyesNeeds a dark sky away from city lights.
- Binoculars (10×50)A sharp point; binoculars bring out its colour and the fainter stars around it.
- Telescope (6–8 inch)Still a point of light at any magnification — stars are too far away to show a disc. Low in the sky, bright stars twinkle and flash colours.
Stars look the same in any instrument: brighter and sharper, but never bigger.
Facts
| Designation | θ Trianguli Australis (θ TrA) |
|---|---|
| Hipparcos number | HIP 81252 |
| Type | Yellow giant |
| Spectral type | G8/K0III |
| Colour | Pale orangeB−V colour index 0.95 |
| Magnitude | 5.5The smaller the number, the brighter. |
| Distance | 340 light-yearsThe light you see left it around 1680. |
| Proper motion | 0.044″ per year across the sky |
| Constellation | Triangulum Australe |
| Right ascension (J2000) | 16h 35m 44.8s |
| Declination (J2000) | −65° 29′ 43″ |
Sources and credits
Star data: HYG Database by David Nash, CC BY-SA 4.0. All data sources →