Blue-white supergiant · Ara
θ Arae
Also known as: θ Ara, HIP 88714
mag 3.7810 light-years
About
θ Arae is a blue-white supergiant of magnitude 3.7 in Ara, about 810 light-years away.
How to find it
- θ Arae is in the constellation Ara.
- Best evenings: around early August 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 30° 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
- EyesVisible from the suburbs on a clear night, but lost in bright city skies.
- 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 Arae (θ Ara) |
|---|---|
| Hipparcos number | HIP 88714 |
| Type | Blue-white supergiant |
| Spectral type | B2Ib |
| Colour | WhiteB−V colour index −0.10 |
| Magnitude | 3.7The smaller the number, the brighter. |
| Distance | 810 light-yearsThe light you see left it around 1210. |
| Proper motion | 0.013″ per year across the sky |
| Constellation | Ara |
| Right ascension (J2000) | 18h 06m 37.9s |
| Declination (J2000) | −50° 05′ 29″ |
Sources and credits
Star data: HYG Database by David Nash, CC BY-SA 4.0. All data sources →