Blue-white star · Hercules
Cujam
Also known as: ω Herculis (ω Her), HIP 80463
mag 4.6250 light-years
About
Cujam (ω Herculis) is a blue-white star of magnitude 4.6 in Hercules, about 250 light-years away.
How to find it
- Cujam is in the constellation Hercules.
- 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 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
| Proper name | Cujam |
|---|---|
| Designation | ω Herculis (ω Her) |
| Hipparcos number | HIP 80463 |
| Type | Blue-white star |
| Spectral type | B9p Cr |
| Colour | WhiteB−V colour index 0.00 |
| Magnitude | 4.6The smaller the number, the brighter. |
| Distance | 250 light-yearsThe light you see left it around 1780. |
| Proper motion | 0.072″ per year across the sky |
| Constellation | Hercules |
| Right ascension (J2000) | 16h 25m 25.0s |
| Declination (J2000) | +14° 02′ 00″ |
More in Hercules
M13Hercules Globular ClusterGlobular cluster · mag 5.9.jpg?width=160)
M92Globular clustermag 6.5.jpg?width=160)
NGC 6229Prize Comet Globular ClusterGlobular cluster · mag 9.9
IC 4593White-eyed Pea NebulaPlanetary nebula · mag 10.7Sources and credits
Star data: HYG Database by David Nash, CC BY-SA 4.0. All data sources →