IC 5146 Cocoon Nebula

IC 5146 - Cocoon Nebula
Object Type: 

A close-up image of IC 5146 Cocoon Nebula, stack of 8,3 hrs: B 7x600" Ha 6nm 14x900" L 10x900" R 7x600" -synthetic green Red-Blu 50%, calibrated and stacked and processed in Pixinsight

Image Calibration 

Center (RA, Dec): (328.359, 47.269)
Center (RA, hms): 21h 53m 26.237s
Center (Dec, dms): +47° 16' 07.813"
Size: 33.3 x 23.9  arcmin
Radius: 0.341 deg
Pixel scale: 0.873 arcsec/pixel
Orientation: Up is -179 degrees E of N


IC 5146

IC 5146 (also Caldwell 19, Sh 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 shines at magnitude +10.0/+9.3/+7.2. It is located near the naked-eye star Pi Cygni, the open cluster NGC 7209 in Lacerta, and the bright open cluster M39.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. (wikipedia)