The Cocoon Nebula
Open cluster with emission and reflection nebulosity
in Cygnus

Uploaded 9/20/12

Select an image size for a larger view: 1024 x 768 1600 x 1200

 This unique object in Cygnus is also known as IC5146 and is in the middle of a large brownish dark nebula seen here as a yellow hue to the center of this field. Punctuating the center of the dark nebula is an illuminated portion which is the Cocoon nebula. It is a sparse open cluster surrounded by a Stromgren sphere of excited hydrogen. Around that is a blue ring of reflection nebulosity.

This is the commissioning shot with the new 12.5" convertible Newtonian, and proves it is working very well. Stars appear sharp and round over the entire field.

Optics: 12.5" f/5 Newtonian - Lumicon Coma Corrector Platform: Astrophysics AP1200 Camera: Hutech Modified Canon XTi @ ISO800 Exposure: 24 x 5m = 2 hours total Location: Payson, Arizona Elevation: 5150 ft. Sky: Seeing 6/10, Transparency 8/10 Outside Temperature: 65F Processing Tools: Photoshop CS2, Images Plus 3.82 HOME GALAXIES EMISSION NEBS REFLECTION NEBS COMETS GLOBULARS OPEN CLUST PLANETARIES LINKS