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Contains:  Cocoon nebula, IC 5146
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IC 5146, Caldwell 19, SH2-125, The Cocoon Nebula, 


            Steven Bellavia
IC 5146, Caldwell 19, SH2-125, The Cocoon Nebula
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IC 5146, Caldwell 19, SH2-125, The Cocoon Nebula

Technical card

Imaging telescopes or lenses: Borg 90FL

Imaging cameras: ZWO ASI 183MM Pro

Mounts: Celestron AVX Mount

Guiding telescopes or lenses: Agena Astro 50mm f/3.9 Guidescope

Guiding cameras: ASI224MC

Focal reducers: Borg 0.72X Quadruplet Super Reducer, #7872

Software: Stark Labs Nebulosity 4.2  ·  Digital Photo Professional  ·  IDEIKI AstroPhotography Tool (APT)

Filters: R  ·  G  ·  Optolong 7nm Ha 2"  ·  B

Dates:July 15, 2018July 18, 2018

Optolong 7nm Ha 2": 12x300" (gain: 100.00) -15C bin 1x1
IDAS UIBAR-III: 30x180" (gain: 100.00) bin 1x1

Integration: 2.5 hours

Darks: ~35

Avg. Moon age: 4.41 days

Avg. Moon phase: 22.22%

Bortle Dark-Sky Scale: 4.00

Temperature: 15.00

Basic astrometry details job: 2161245

RA center: 21h 50' 46"

DEC center: +47° 23' 56"

Pixel scale: 1.355 arcsec/pixel

Orientation: 178.627 degrees

Field radius: 1.086 degrees

Resolution: 4800x3200

Data source: Backyard


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 cluster is also known as Collinder 470. Its magnitude is estimated between 7.2 to 10.0

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.



Steven Bellavia
License: None (All rights reserved)

Sky plot

Sky plot


IC 5146, Caldwell 19, SH2-125, The Cocoon Nebula, 


            Steven Bellavia