Yellow giant · Capricornus
Algedi
Also known as: α² Capricorni (α² Cap), HIP 100064
mag 3.6110 light-years
About
Algedi (α² Capricorni) is a yellow giant of magnitude 3.6 in Capricornus, about 110 light-years away.
How to find it
- Algedi is in the constellation Capricornus.
- Best evenings: around early September 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 67° 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
| Proper name | Algedi |
|---|---|
| Designation | α² Capricorni (α² Cap) |
| Hipparcos number | HIP 100064 |
| Type | Yellow giant |
| Spectral type | G6/G8III |
| Colour | Pale orangeB−V colour index 0.88 |
| Magnitude | 3.6The smaller the number, the brighter. |
| Distance | 110 light-yearsThe light you see left it around 1920. |
| Proper motion | 0.062″ per year across the sky |
| Constellation | Capricornus |
| Right ascension (J2000) | 20h 18m 03.3s |
| Declination (J2000) | −12° 32′ 42″ |
More in Capricornus
Sources and credits
Star data: HYG Database by David Nash, CC BY-SA 4.0. All data sources →