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Contains:  North America nebula, NGC 7000, NGC 6997, Pelican nebula, IC 5070, The star 57Cyg, The star 56Cyg
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North America and Pelican Nebula (NGC7000 and IC5070), 





    
        

            Andrew Klinger
North America and Pelican Nebula (NGC7000 and IC5070)

North America and Pelican Nebula (NGC7000 and IC5070)

Technical card

Resolution: 4500x3368

Dates:June 20, 2017

Frames:
ZWO B 1.25": 10x180" -20C bin 1x1
ZWO G 1.25": 10x180" -20C bin 1x1
ZWO L 1.25": 58x180" -20C bin 1x1
ZWO R 1.25": 10x180" -20C bin 1x1

Integration: 4.4 hours

Darks: ~60

Flats: ~30

Bias: ~200

Avg. Moon age: 25.35 days

Avg. Moon phase: 18.47%

Bortle Dark-Sky Scale: 3.00

Astrometry.net job: 2052964

RA center: 313.993 degrees

DEC center: 44.144 degrees

Pixel scale: 2.019 arcsec/pixel

Orientation: 357.688 degrees

Field radius: 1.576 degrees

Locations: Atoka dark site, Atoka, Oklahoma, United States

Data source: Unknown

Description

The North America and Pelican nebula in Cygnus are emission regions located 1500 light-years away, and 50 light-years across. The dense dusty region spanning along the lower left is known as the Cygnus Wall, where stars are likely forming within.

Equipment:
OTA: William Optics GT81 w/0.8x reducer (382mm fl at f/4.7)
Mount: Orion Sirius EQ-G (HEQ-5)
Guidescope: Orion 50mm guidescope
Guiding camera: Orion StarShoot Autoguider
Imaging camera: ZWO ASI1600MM-Cool

Software:
SGP
PHD2
CdC
PixInsight

Acquisition:
Location: Atoka, Oklahoma (Bortle 3)
Dates: 6/19/17, 6/20/17
Gain: 0 Offset: 10
Camera temp: -20C
L: 58x180"
R: 10x180"
G: 10x180"
B: 10x180"
Total integration time: 4hr 24min
60x darks
30x flats per filter
200x bias (master bias in library)

Preprocessing:
Batch PreProcessing script to generate calibrated/registered images
ImageIntegration (Linear Fit rejection for L, Percentile rejection for RGB)
DynamicCrop the masters
DBE on each master

RGB processing:
LinearFit to Red channel
ChannelCombination to combine
BackgroundNeutralization
ColorCalibration
SCNR green
TGV and MMT noise reduction (via Jon Rista's method)
HistogramTransformation x3 using a starmask to manually perform a masked stretch
CurvesTransformation w/starmask to saturate stars
CurvesTransformation using mask generated by ColorMaskScript (red channel) to saturate nebulosity
CurvesTransformation w/~starmask for contrast
MorphologicalTransformation for star reduction
SCNR green

L processing:
Deconvolution
HistogramTransformation x4 using a starmask to manually perform a masked stretch
Duplicated the image to create a starless version, using a starmask and several iterations of MMT and MT. Then pushed the faint nebulosity in the starless version using PixelMath expression: "1-(1-$T)*(1-$T)"
Combined the starless version with the image using PixelMath expression "F=0.4; (1-(1-$T)*(1-s)*F)+($T*~F)" followed by the same function but with a value of F=0.2. (s=starless photo).
HistogramTransformation to move black point
LocalHistogramEqualization with inverted starmask
CurvesTransformation for contrast
MorphologicalTransformation for star reduction
DarkStructureEnhance Script

Combined L and RGB with the script "LRVB-AIP"
CurvesTransformation to boost saturation further
SCNR green

Comments

Author

ak_astro
Andrew Klinger
License: None (All rights reserved)
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North America and Pelican Nebula (NGC7000 and IC5070), 





    
        

            Andrew Klinger