IC-5146 (Cocoon Nebula) (Joel Shepherd)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: B168 · Cocoon nebula · IC 5146 · Sh2-125 · VdB147

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IC-5146 (Cocoon Nebula)

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IC-5146 (Cocoon Nebula)

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.

Original
B
Final
C

C

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.

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Status	Advanced success
Started	...
Astrometry.net job	1834242
PixInsight job	R54ND882TF6VOV45MALLI4G1S3G3GDFL
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	21h53m28s.71
RA (top/left)	21h52m01s.54
RA (top/right)	21h53m23s.73
RA (bottom/right)	21h54m55s.79
RA (bottom/left)	21h53m33s.40

Dec (center)	+47°15′53″.3
Dec (top/left)	+47°17′19″.1
Dec (top/right)	+47°01′03″.4
Dec (bottom/right)	+47°14′22″.10
Dec (bottom/left)	+47°30′41″.5

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IC-5146 (Cocoon Nebula)

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