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


            Joel Shepherd
IC-5146 (Cocoon Nebula)
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IC-5146 (Cocoon Nebula)

Technical card

Dates:July 23, 2017July 24, 2017

Baader Planetarium B 1.25": 18x300" bin 1x1
Baader Planetarium G 1.25": 18x300" bin 1x1
Baader Planetarium R 1.25": 18x300" bin 1x1

Integration: 4.5 hours

Avg. Moon age: 0.66 days

Avg. Moon phase: 0.84%

Bortle Dark-Sky Scale: 6.00

Basic astrometry details job: 1834242

RA center: 21h 53' 28"

DEC center: +47° 15' 54"

Pixel scale: 1.005 arcsec/pixel

Orientation: 130.494 degrees

Field radius: 0.248 degrees

Resolution: 1280x1228

Locations: Home, Seattle, WA, United States

Data source: Backyard


Subject: IC-5146: A star-forming cloud of dust and gasses, 15 light-years across and located about 4000 light-years from earth (in the constellation Cygnus).

Capture notes: RGB captured over two dark nights in late July. I also captured three hours of luminance which I ended up not using. I experimented with 10-minute subs for the luminance, which was too much. They ended up being considerably noisier than the synthetic luminance used here, and with more blown-out stars.

Processing notes: Luminance was created by doing a noise-weighted average of the individual RGB stacks, without rejection. I'm a little disappointed by the color: the stars are a little overwhelming and the dim surrounding haze has a reddish hue to it which seems off. This was a surprisingly difficult target to both shoot (very dim under our light-polluted skies) and process.



Joel Shepherd
License: Attribution Creative Commons


  • IC-5146 (Cocoon Nebula), 


            Joel Shepherd
  • Final
    IC-5146 (Cocoon Nebula), 


            Joel Shepherd


Description: Reprocessed this in November. A little happier with the colors and detail; still not so happy with the fuzzy stars but I think at least some of that is due to dust in the target scattering the light. Putting away for a while: I've found this to be a quite difficult target to process.

Sky plot

Sky plot


IC-5146 (Cocoon Nebula), 


            Joel Shepherd

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Images from the EdgeHD Series