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Contains:  Cocoon nebula, IC 5146
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IC 5146 (the Cocoon Nebula), 


            Randal Healey
IC 5146 (the Cocoon Nebula)

IC 5146 (the Cocoon Nebula)

Technical card

Resolution: 3367x2547

Dates:June 11, 2019June 12, 2019June 13, 2019

Astrodon BLUE 36mm - Gen2 E-Series Tru-Balance: 20x300" -10C bin 1x1
Astrodon GREEN 36mm - Gen2 E-Series Tru-Balance: 18x300" -10C bin 1x1
Astrodon HA 36mm - 5nm: 16x600" -10C bin 1x1
Astrodon LUM 36mm - Gen2 E -Series Tru-Balance: 25x180" -10C bin 1x1
Astrodon RED 36mm - Gen2 E-Series Tru-Balance: 19x300" -10C bin 1x1

Integration: 8.7 hours

Darks: ~50

Flats: ~50

Bias: ~100

Avg. Moon age: 9.79 days

Avg. Moon phase: 74.13% job: 2756850

RA center: 328.398 degrees

DEC center: 47.290 degrees

Pixel scale: 0.838 arcsec/pixel

Orientation: 189.310 degrees

Field radius: 0.491 degrees

Locations: Healey "Utahopia" Observatory, Kaysville, Utah, United States

Data source: Own remote observatory


IC 5146 (the Cocoon Nebula) is a reflection/emission nebula in the constellation Cygnus. 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 forming the appearance of a trail behind the Cocoon. IC 5146 is a stellar nursery where star-formation is ongoing. Observations by both the Spitzer Space Telescope and the Chandra X-ray Observatory have collectively identified hundreds of young stellar objects. Young stars are seen in both the emission nebula, where gas has been ionized by massive young stars, and in the infrared-dark molecular cloud that forms the "tail". The most-massive stars in the region is BD +46 3474, a star of class B1 that is an estimated 14±4 times the mass of the sun. (Credit: Wikipedia)

I hope you enjoy.



Randal Healey
License: None (All rights reserved)


  • IC 5146 (the Cocoon Nebula), 


            Randal Healey
  • Final
    IC 5146 (the Cocoon Nebula), 


            Randal Healey

Sky plot

Sky plot


IC 5146 (the Cocoon Nebula), 


            Randal Healey