Cocoon wide field in HaLRGB (JohnHen)

Image of the day 05/18/2023

Cocoon wide field in HaLRGB

Cocoon wide field
The cocoon is a reflection/emission nebula in Cygnus around 2,500 light-years away. The designation IC 5146 refers to the star forming region with a cluster of stars of Mag 9.5. Part of the entire ensemble are dark nebulae most prominently Barnard 168 which appears to be a trail of the cocoon. Directly East of the cocoon is the (blueish) reflection nebula vdB 147.
The wide-field of this photograph goes further to the North where the reflection nebula vdB 145 (orangish) can be seen and the blueish Mag 6.5 star is V2173 Cyg.
To the South there is a group of galaxies among them PGC 67262 of Mag 13.61 and PGC 67264 of Mag 15.1 (the two interacting galaxies) as well as other 15+ Mag galaxies. The tiny needle-shaped galaxy (size 1'22'') South of the cocoon (need to zoom in) is PGC 67511 at Mag 17.0.

Capturing and processing
Captured from Aug. to Oct. 2022 i originally collected more than 65 hrs of data but had to discard almost 20 hrs because of sub-par seeing. I have cropped the full frame image that extended to the West all the way to the star cluster NGC 7209 but decided to concentrate on the busy cocoon surroundings (may do a reprocessing to show the entire full frame field later). The cocoon is embedded in a dense star field. So, one decision to be made is how far to stretch stars while still be able to see the faint nebulosity and Ha structures beneath. I am also providing an un-obstructed glimpse to the starless version. One thing I wasn't sure about was the distribution between Ha and Lum subs. Ended up with 23 hrs Ha which was a good choice because some Ha structures seen would hardly be visible with less. The 17 hrs of Lum appear sufficient but, well, more is always better in astro photography ...

Thx and CS, John

P.S.: The indents visible at large bright stars are the 'signature' of the FSQ-85EDX.

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Status	Advanced success
Started	...
PixInsight job	UEPPN27EI8O7GSFNAQVB5KCCU3Q5LO7V
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	21h49m20s.51
RA (top/left)	21h58m09s.53
RA (top/right)	21h40m29s.26
RA (bottom/right)	21h41m02s.60
RA (bottom/left)	21h57m48s.57

Dec (center)	+47°25′49″.3
Dec (top/left)	+48°48′58″.7
Dec (top/right)	+48°47′30″.0
Dec (bottom/right)	+46°00′28″.5
Dec (bottom/left)	+46°01′10″.8

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Image of the day 05/18/2023

Cocoon wide field in HaLRGB

Image of the day 05/18/2023

Cocoon wide field in HaLRGB

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Image of the day 05/18/2023

Cocoon wide field in HaLRGB

Image of the day 05/18/2023

Cocoon wide field in HaLRGB

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