Red star · Orion
ο¹ Orionis
Also known as: ο¹ Ori, HIP 22667
mag 4.7650 light-years
About
ο¹ Orionis is a red star of magnitude 4.7 in Orion, about 650 light-years away.
How to find it
- ο¹ Orionis is in the constellation Orion.
- Best evenings: around mid-January 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 66° 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 | ο¹ Orionis (ο¹ Ori) |
|---|---|
| Hipparcos number | HIP 22667 |
| Type | Red star |
| Spectral type | M3Sv |
| Colour | Orange-redB−V colour index 1.77 |
| Magnitude | 4.7The smaller the number, the brighter. |
| Distance | 650 light-yearsThe light you see left it around 1380. |
| Proper motion | 0.056″ per year across the sky |
| Constellation | Orion |
| Right ascension (J2000) | 04h 52m 32.0s |
| Declination (J2000) | +14° 15′ 02″ |
Sources and credits
Star data: HYG Database by David Nash, CC BY-SA 4.0. All data sources →