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Contains:  North America nebula, NGC 7000, NGC 6997, Pelican nebula, IC 5070, IC 5068, The star ξCyg, The star 57Cyg, The star 56Cyg, The star Deneb (αCyg)
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NGC 7000 and Pelican - Bi Color, 





    
        

            Jonathan W MacCollum
NGC 7000 and Pelican - Bi Color

NGC 7000 and Pelican - Bi Color

Technical card

Resolution: 4922x3290

Frames:
Astrodon 1.25" 5nm Ha: 127x60" (gain: 111.00) -10C
Astrodon O3 1.25" 3nm: 21x120" (gain: 111.00) -10C
Astrodon O3 1.25" 3nm: 51x240" (gain: 111.00) -10C

Integration: 6.2 hours

Darks: ~60

Flats: ~30

Flat darks: ~30

Bortle Dark-Sky Scale: 4.00

Astrometry.net job: 2840167

RA center: 313.568 degrees

DEC center: 43.835 degrees

Pixel scale: 3.822 arcsec/pixel

Orientation: 179.372 degrees

Field radius: 3.143 degrees

Data source: Backyard

Description

Just getting started with narrowband imaging. I am really liking this image scale for the 135mm f2 lens. This was taken wide open at f2.0.

127x60s - 5nm Ha
51x240s - 3nm Oiii
21x120s - 3nm Oiii

Both channels were processed using the following workflow:
* Dynamic Background Extraction
* 45 rounds of wavelet regularized deconvolution using a Dynamic PSF made from the best 50-60 stars in the middle of the frame, and replaced stars using a starnet made starmask.
* Small Scale TGV noise reduction using a low-contrast mask
* Masked Stretched with a preview-aggregated background reference
* Histogram Stretch to taste

The Bi-Color combination was performed with starnet starless versions using the following expressions:

iif(HaStarless > .15, HaStarless, (HaStarless*.8)+(OiiiStarless*.2))
iif(HaStarless > 0.5, 1-(1-OiiiStarless)*(1-(HaStarless-0.5)), OiiiStarless *(HaStarless+0.5))
iif(OiiiStarless > .1, OiiiStarless, (HaStarless*.3)+(OiiiStarless*.2))

A star mask was created using the Starnet data to make a StarsOnly image, and PixelMath was used to bring in the RGB star color that was taken from my 071mc data that was processed and posted here: https://www.astrobin.com/413476/?nc=user

Comments

Author

eigenVector
Jonathan W MacCollum
License: Attribution-NoDerivs Creative Commons
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NGC 7000 and Pelican - Bi Color, 





    
        

            Jonathan W MacCollum