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Contains:  Cocoon nebula, IC 5146
Getting plate-solving status, please wait...
Cocoon Nebula - Rework, 


            Thomas Richter
Cocoon Nebula - Rework

Cocoon Nebula - Rework

Technical card

Resolution: 5119x3511 job: 2682707

RA center: 328.370 degrees

DEC center: 47.260 degrees

Pixel scale: 0.493 arcsec/pixel

Orientation: 356.437 degrees

Field radius: 0.425 degrees

Locations: Nürnberg, Nürnberg, Bayern, Germany

Data source: Backyard


This is a rework of my Cocoon Nebula from 2018.

Dates:July 13, 2018, July 14, 2018, July 16, 2018
Baader B 1.25'' CCD Filter: 23x240" (gain: 53.00) -20C bin 1x1
Baader G 1.25'' CCD Filter: 23x240" (gain: 53.00) -20C bin 1x1
Baader L 1.25'' Filter: 56x240" (gain: 53.00) -20C bin 1x1
Baader R 1.25'' CCD Filter: 23x240" (gain: 53.00) -20C bin 1x1

Integration: 8.3 hours

Darks: 29
Flats: 27
Bias: 100

Object description ( :

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. 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. 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.



Thomas Richter
License: None (All rights reserved)

Sky plot

Sky plot


Cocoon Nebula - Rework, 


            Thomas Richter