White giant · Sextans
α Sextantis
Also known as: α Sex, HIP 49641
mag 4.5280 light-years
About
α Sextantis is a white giant of magnitude 4.5 in Sextans, about 280 light-years away.
How to find it
- α Sextantis is in the constellation Sextans.
- Best evenings: around early April 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 80° 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
- 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 | α Sextantis (α Sex) |
|---|---|
| Hipparcos number | HIP 49641 |
| Type | White giant |
| Spectral type | A0III |
| Colour | WhiteB−V colour index −0.03 |
| Magnitude | 4.5The smaller the number, the brighter. |
| Distance | 280 light-yearsThe light you see left it around 1740. |
| Proper motion | 0.026″ per year across the sky |
| Constellation | Sextans |
| Right ascension (J2000) | 10h 07m 56.3s |
| Declination (J2000) | −00° 22′ 18″ |
Sources and credits
Star data: HYG Database by David Nash, CC BY-SA 4.0. All data sources →