The Cocoon Nebula, IC 5146 in SHO (HST): a rare aspect (Rick Veregin)

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

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The Cocoon Nebula, IC 5146 in SHO (HST): a rare aspect

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The Cocoon Nebula, IC 5146 in SHO (HST): a rare aspect

The RASC Robotic Telescope had SHO data with RGB stars, which I had not seen anywhere. It turns out to be a bit of a challenge, as there is essentially no OIII (Blue) in the Nebula, just some contribution from the bright blue stars. And the Ha (Green) is very dominant. This is my best attempt at an SHO processing to HST. I used Ha to enhance the Red from SiII and the OIII to mute the Green from Ha using a 40-60,70-30,100 split in StarTools. Topaz AI Denoise was used to reduce noise. And RGB stars were added in Photoshop.

Cocoon Nebula ic5146

Date 2019 July

Exposure Narrowband 19.5 hrs RGB 45

Narrowband (Ha, OIII, SII) (13,13,13) 1800 sec 1x1

Narrowband Flats 30

RGB for star colors 15 180 sec 1x1

RGB flats (5,5,5) 1x1

Location Sierra Remote Observatories, Aubery, California

Telescope RCOS 16" f/8.9 (3550mm focal length)

Camera SBIG STX16803 16MP (4096 x 4096)

Mount Paramount ME

Filters SBIG LRGB, SBIG Ha (7nm), OIII (8.5nm), SII (8nm)

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Status	Advanced success
Started	...
Astrometry.net job	4194900
PixInsight job	YVHN0CASF33GZKCVHAGF1N8XHAMYMILR
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	21h53m45s.920
RA (top/left)	21h55m23s.305
RA (top/right)	21h52m53s.705
RA (bottom/right)	21h52m09s.141
RA (bottom/left)	21h54m37s.479

Dec (center)	+47°10′39″.34
Dec (top/left)	+47°19′26″.39
Dec (top/right)	+47°27′08″.65
Dec (bottom/right)	+47°01′48″.61
Dec (bottom/left)	+46°54′09″.92

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The Cocoon Nebula, IC 5146 in SHO (HST): a rare aspect

The Cocoon Nebula, IC 5146 in SHO (HST): a rare aspect

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The Cocoon Nebula, IC 5146 in SHO (HST): a rare aspect

The Cocoon Nebula, IC 5146 in SHO (HST): a rare aspect

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