13 Sept 2020
This deep sky target is a wonderful mix of an open cluster, an emission nebula, a reflection nebula and a dark nebula. It lies in the constellation Sagittarius and was discovered by Charles Messier in 1974! It is relatively close to Earth compared with any other DSOs that I have captured lying 5,200 light years away.
M20
10 credit
Filtro | Exp. media (s) | Esposizione totale | Sottoframe |
|---|---|---|---|
| Luminance | 67 | 40m | 36 |
| Red | 69 | 40m | 35 |
| Green | 857 | 8h20m | 35 |
| Blue | 65 | 38m | 35 |
| Halpha | 806 | 7h50m | 35 |