Yellow subgiant · Hydrus
β Hydri
Also known as: β Hyi, HIP 2021
mag 2.824 light-years
About
β Hydri is a yellow subgiant of magnitude 2.8 in Hydrus, about 24 light-years away.
How to find it
- β Hydri is in the constellation Hydrus.
- Best evenings: around mid-November 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 south of 3° N.
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
- EyesEasy, even from town.
- 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 Hydri (β Hyi) |
|---|---|
| Hipparcos number | HIP 2021 |
| Type | Yellow subgiant |
| Spectral type | G2IV |
| Colour | YellowB−V colour index 0.62 |
| Magnitude | 2.8The smaller the number, the brighter. |
| Distance | 24 light-yearsThe light you see left it around 2002. |
| Proper motion | 2.24″ per year across the sky |
| Constellation | Hydrus |
| Right ascension (J2000) | 00h 25m 40.5s |
| Declination (J2000) | −77° 15′ 15″ |
Sources and credits
Star data: HYG Database by David Nash, CC BY-SA 4.0. All data sources →