The Cocoon Nebula (also IC 5146, Caldwell 19, Sh 2-125) is a reflection nebula in Cygnus. Baring the Cocoon, dark nebula Barnard 168 forms a dark lane surrounding the cluster and projecting westward. This dataset is fun to work with, as it has colors (RGB) and Narrow Band (Ha, OIII, SII), and all 3 narrow bands have fairly good signal, allowing to experiment with the combination of those 6 channels.

The RGB Image.
Ha stack.
Narrow band combination approximating true colors.
SHO-AIP script to bring up OIII and SII to Ha level.

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