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Contains:  56 Cyg, 57 Cyg, B349, IC 5070, IC5070, NGC 6997, NGC6997, Pelican nebula, The star 56Cyg, The star 57Cyg
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IC5070 - Pelican  - HOhOh, 


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IC5070 - Pelican - HOhOh

Technical card

Imaging telescopes or lenses:80ED

Imaging cameras:ZWO ASI 1600MM Cooled Pro

Mounts:SkyWatcher EQ6-R Stellardrive

Guiding telescopes or lenses:TS Optics 60 MM GuideScope

Guiding cameras:ZWO Optical ASI120MM

Focal reducers:Skywatcher 0.85X reducer/flattener

Software:StellariumSGProPixInsight 1.8 Ripley

Filters:ZWO S-II 7nmZWO O-III 7nmZWO HAlpha 7nm

Accessory:ZWO 8 Position EFW

Dates:June 30, 2019July 5, 2019

ZWO HAlpha 7nm: 250x180" (gain: 139.00) -20C bin 1x1
ZWO O-III 7nm: 221x180" (gain: 139.00) -20C bin 1x1

Integration: 23.6 hours

Avg. Moon age: 15.04 days

Avg. Moon phase: 8.46%

Bortle Dark-Sky Scale: 8.00 job: 2823793

RA center: 20h 51' 40"

DEC center: +44° 0' 49"

Pixel scale: 1.497 arcsec/pixel

Orientation: 0.662 degrees

Field radius: 1.173 degrees

Resolution: 4532x3353

Data source: Backyard


The Pelican is an iconic target but hard to process (just look at how few IOTD of this image exists on ABIN while there are probably 20+ pages of various versions).

After 3 weeks of head scratching and about 10 versions, I almost gave up but it was not reasonable to throw almost 24h of integration.

Color balance is hard so I opted for an overall compromise where I would get blue tones in the left part of the pelican, purple in the center, reds in the right part, pinks in the head and browns in the upperleft dusts and bottom center right of the body (see various image rev)

As always you are tempted to go overboard in terms of color saturation, contrasts , decon... Not sure I mastered it but now I can sleep peacefully and let this epic bird fly away.
Unfortunately the ZWO O3 filter is spitting out nasty halos that are very hard to process around large stars.
Deconvolution was very effective and recovered tons of details.
I also made the choice not to leave the image at it's native scale and denoising was made only in the linear stage with TGV.

Will revisit it next year by adding SII and we'll see what comes out of it.

Thanks to Cyber (Victor) for always being supportive and to Jon Rista for his initial feedback.



License: None (All rights reserved)

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IC5070 - Pelican  - HOhOh,