Hemisphere:  Northern  ·  Contains:  B168  ·  Cocoon nebula  ·  IC 5146  ·  IC5146  ·  Sh2-125  ·  VdB147
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Cocoon Nebula - Rework, 


            Thomas Richter
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Cocoon Nebula - Rework

Technical card

Imaging telescopes or lenses: GSO 8" f/5 Newton

Imaging cameras: ZWO ASI 183 MM PRO

Mounts: SkyWatcher NEQ6 Pro Goto

Guiding telescopes or lenses: GSO 8" f/5 Newton

Guiding cameras: Astrolumina Alccd5L-IIc

Focal reducers: Pal Gyulai GPU Aplanatic Koma Korrector 4-element

Software: PhotoShop CS5  ·  PHD2 Guiding  ·  FitsWork 4  ·  DeepSky Stacker Deep Sky Stacker 3.3.4  ·  CCDCiel

Filters: Baader R 1.25'' CCD Filter  ·  Baader B 1.25'' CCD Filter  ·  Baader G 1.25'' CCD Filter

Accessory: TSOptics TS Off Axis Guider - 9mm

Astrometry.net job: 2682707

RA center: 21h 53' 28"

DEC center: +47° 15' 34"

Pixel scale: 0.494 arcsec/pixel

Orientation: 3.517 degrees

Field radius: 0.425 degrees

Resolution: 5119x3511

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 (wikipedia.org) :

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)

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Sky plot


Cocoon Nebula - Rework, 


            Thomas Richter