White subgiant · Boötes
ζ Boötis
Also known as: ζ Boo, HIP 71795
mag 3.8180 light-years
About
ζ Boötis is a white subgiant of magnitude 3.8 in Boötes, about 180 light-years away.
How to find it
- ζ Boötis is in the constellation Boötes.
- Best evenings: around mid-June 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
- 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 | ζ Boötis (ζ Boo) |
|---|---|
| Hipparcos number | HIP 71795 |
| Type | White subgiant |
| Spectral type | A3IVn |
| Colour | WhiteB−V colour index 0.04 |
| Magnitude | 3.8The smaller the number, the brighter. |
| Distance | 180 light-yearsThe light you see left it around 1850. |
| Proper motion | 0.054″ per year across the sky |
| Constellation | Boötes |
| Right ascension (J2000) | 14h 41m 09.0s |
| Declination (J2000) | +13° 43′ 42″ |
Sources and credits
Star data: HYG Database by David Nash, CC BY-SA 4.0. All data sources →