M11
M11 aka Wild Duck Cluster or NGC 6705 is an open cluster in the constellation Scutum. It's one of the most compact of the known open clusters. It's age is estimated at 250 million years and it's distance about 5000 light years.
Image data: RGB (R 8x10m, G 8x10m, B 10x10m); seeing 0.8-1.2 arcsec, 80cm f/7 Astrooptik Keller corrected cassegrain, FLI Proline 16803, Baader Filters, Prompt 7 CTIO Chile, robotic data acquisition, processing: Volker Wendel