White subgiant · Capricornus
Deneb Algedi
Also known as: δ Capricorni (δ Cap), HIP 107556
mag 2.939 light-years
About
Deneb Algedi (δ Capricorni) is a white subgiant of magnitude 2.9 in Capricornus, about 39 light-years away.
How to find it
- Deneb Algedi is in the constellation Capricornus.
- Best evenings: around early October 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 64° 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
| Proper name | Deneb Algedi |
|---|---|
| Designation | δ Capricorni (δ Cap) |
| Hipparcos number | HIP 107556 |
| Type | White subgiant |
| Spectral type | A5mF2 (IV) |
| Colour | Yellowish whiteB−V colour index 0.18 |
| Magnitude | 2.9The smaller the number, the brighter. |
| Distance | 39 light-yearsThe light you see left it around 1987. |
| Proper motion | 0.40″ per year across the sky |
| Constellation | Capricornus |
| Right ascension (J2000) | 21h 47m 02.4s |
| Declination (J2000) | −16° 07′ 38″ |
More in Capricornus
Sources and credits
Star data: HYG Database by David Nash, CC BY-SA 4.0. All data sources →