Messier 21
Messier 21 is an open cluster (OC) found in the constellation of Sagittarius . Here are some key stats on Messier 21 :
| Cluster name: | Messier 21 |
| Magnitude: | 5.9 |
| Constellation: | Sagittarius |
| Size (arc-minutes): | 14' |
| Age (my): | 12 my |
| Distance (ly): | ly |
| Right Ascension: | 18h 04.2m |
| Declination: | -22° 29' |