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IC 5146 (also Caldwell 19, Sh 2-125, and the Cocoon Nebula) is a reflection[1]/emission[2] nebula and Caldwell object in the constellation Cygnus. IC 5146 refers specifically to the star cluster and Sh2-125 to the nebula.[3] It shines at magnitude +10.0[4]/+9.3[2]/+7.2.[5] Its celestial coordinates are RA 21h 53.5m, dec+47° 16′. It is located near the naked-eye star Pi Cygni, the open cluster NGC 7209 in Lacerta, and the bright open cluster M39.[1][4] The cluster is about 4,000 ly away, and the central star that lights it formed about 100,000 years ago;[6] the nebula is about 12 arcmins across, which is equivalent to a span of 15 light years.[5] 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.
[Ref: Wikipedia]


 

Image Details

  Cocoon Nebula

Imaging Details
IC Number:
IC 5146

Common Name(s):
Cocoon Nebula

Other Designations:
Caldwell 19, Sh 2-125

Object Type:
Reflection/Emission Nebula

Object Class:
Nebula

Constellation:
Cygnus

RA / 
21h 53.5m
Dec:
+47° 16′

Distance from Earth:
4,000 ly

Object Size:
~ 12 arcmin

Magnitude:
10
Cacoon Nebule
Date:
November 15, 2011 


Location:
Auburn, IN  46706
(41° 18' 37.8" N, 85° 04' 21.6" W)


Equipment:
RC-16 2 f/8.5
SBIG ST11000M
Mathis MI-750 Fork Mount

Integrations:
Ha  :  1 x 10 min
     
     
     
     


Software:
Maxim/DL 4.57
AIP4Win v2
Photoshop CS3