Yellow main-sequence star
Groombridge 1830
Also known as: HIP 57939
mag 6.430 light-years
About
Groombridge 1830 is a yellow main-sequence star of magnitude 6.4, about 30 light-years away.
How to find it
- Best evenings: around early May 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 42° 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
- EyesAt the very limit of the naked eye; binoculars show it easily.
- 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 | Groombridge 1830 |
|---|---|
| Hipparcos number | HIP 57939 |
| Type | Yellow main-sequence star |
| Spectral type | G8Vp |
| Colour | YellowB−V colour index 0.75 |
| Magnitude | 6.4The smaller the number, the brighter. |
| Distance | 30 light-yearsThe light you see left it around 1996. |
| Proper motion | 7.06″ per year across the sky |
| Right ascension (J2000) | 11h 52m 58.2s |
| Declination (J2000) | +37° 43′ 07″ |
Sources and credits
Star data: HYG Database by David Nash, CC BY-SA 4.0. All data sources →