White main-sequence star · Serpens
β Serpentis
Also known as: β Ser, HIP 77233
mag 3.7160 light-years
About
β Serpentis is a white main-sequence star of magnitude 3.7 in Serpens, about 160 light-years away.
How to find it
- β Serpentis is in the constellation Serpens.
- Best evenings: around early 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 65° 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
- 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 | β Serpentis (β Ser) |
|---|---|
| Hipparcos number | HIP 77233 |
| Type | White main-sequence star |
| Spectral type | A3V |
| Colour | WhiteB−V colour index 0.07 |
| Magnitude | 3.7The smaller the number, the brighter. |
| Distance | 160 light-yearsThe light you see left it around 1870. |
| Proper motion | 0.080″ per year across the sky |
| Constellation | Serpens |
| Right ascension (J2000) | 15h 46m 11.3s |
| Declination (J2000) | +15° 25′ 18″ |
Sources and credits
Star data: HYG Database by David Nash, CC BY-SA 4.0. All data sources →