Cocoon Nebula

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IC 5146 (also Caldwell 19Sh 2-125, and the Cocoon Nebula) is a reflection/emission nebula and Caldwell object in the constellation Cygnus. The NGC description refers to IC 5146 as a cluster of 9.5 mag stars involved in a bright and dark nebula. The cluster is also known as Collinder 470. It is located near the naked-eye star Pi Cygni, the open cluster NGC 7209 in Lacerta, and the bright open clusterM39. The cluster is about 4,000 ly away, and the central star that lights it formed about 100,000 years ago; the nebula is about 12 arcmins across, which is equivalent to a span of 15 light years. When viewing IC 5146, dark nebula Barnard 168 (B168) is an inseparable part of the experience, forming a dark lane that surrounds the cluster and projects westward forming the appearance of a trail behind the Cocoon.

Imaging telescopes or lenses: GSO 8″ f/8 RC GSO
Imaging cameras: SBIG ST-8300M
Mounts: 10Micron GM2000 QCI
Software: MSB Software AstroArt 5
Filters: Baader Planetarium LRGB CCD 1.25″
Dates: Sept. 26, 2011
Frames: 48×300″
Integration: 4.0 hours

Author: Hermann Schieder

AstroPhotography of the day by SPONLI 12 June 2014