Messier 21   HOME INDEX BACK NEXT

Open Cluster in Sagittarius

Messier 21 is small open cluster with an irregular shape, located just northeast of the Trifid Nebula (Messier 20). It is a pretty cluster consisting af a few sparkling bright stars and many smaller ones. The surrounding region is filled with many star clusters and nebulae, with the famous Lagoon Nebula (Messier 8) just about 2 degrees to the south.

Magnitude 5.9
Apparent Size 15'
Distance (light yrs) 4,100
Right Ascension 18:04.2
Declination -22 30
Field of View 35' x 26'

Image details:  Exposure times of 48 minutes luminance and 18 minutes each of red, green and blue, taken with an SBIG ST-8300M imager and a 12" Meade telescope at f/5.6.

August 2013