White main-sequence star · Triangulum
ε Trianguli
Also known as: ε Tri, HIP 9570
mag 5.5390 light-years
About
ε Trianguli is a white main-sequence star of magnitude 5.5 in Triangulum, about 390 light-years away.
How to find it
- ε Trianguli is in the constellation Triangulum.
- Best evenings: around early December 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 north of 47° S.
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 | ε Trianguli (ε Tri) |
|---|---|
| Hipparcos number | HIP 9570 |
| Type | White main-sequence star |
| Spectral type | A2V |
| Colour | WhiteB−V colour index 0.03 |
| Magnitude | 5.5The smaller the number, the brighter. |
| Distance | 390 light-yearsThe light you see left it around 1630. |
| Proper motion | 0.017″ per year across the sky |
| Constellation | Triangulum |
| Right ascension (J2000) | 02h 02m 58.0s |
| Declination (J2000) | +33° 17′ 03″ |
Sources and credits
Star data: HYG Database by David Nash, CC BY-SA 4.0. All data sources →