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Contains:  IC 1275, NGC 6559, IC 1274, IC 4685, IC 4684, NGC 6544, NGC 6546, NGC 6530, M 8, Lagoon nebula, Hourglass nebula, NGC 6523, NGC 6526, The star 11Sgr, The star 9Sgr, The star 7Sgr
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The Lagoon Nebula (M8) imaged in HaRGB, 





    
        

            Andrew Klinger
The Lagoon Nebula (M8) imaged in HaRGB

The Lagoon Nebula (M8) imaged in HaRGB

Technical card

Resolution: 4512x3321

Dates:June 11, 2018July 31, 2018

Frames:
ZWO B 1.25": 30x180" (gain: 76.00) -10C bin 1x1
ZWO G 1.25": 27x180" (gain: 76.00) -10C bin 1x1
Astrodon Ha 5nm: 74x300" (gain: 200.00) -10C bin 1x1
ZWO R 1.25": 33x180" (gain: 76.00) -10C bin 1x1

Integration: 10.7 hours

Darks: ~64

Flats: ~30

Bias: ~200

Avg. Moon age: 22.48 days

Avg. Moon phase: 47.90%

Bortle Dark-Sky Scale: 4.00

Astrometry.net job: 2232270

RA center: 271.551 degrees

DEC center: -24.064 degrees

Pixel scale: 2.019 arcsec/pixel

Orientation: 52.682 degrees

Field radius: 1.571 degrees

Locations: Backyard, Flower Mound, Texas, United States

Data source: Backyard

Description

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: Flower Mound, TX for Ha(Bortle 7), Atoka, OK for RGB (Bortle 3)
Dates: 6/11/18, 7/31/18, 8/1/18
Gain: 200 Offset: 50 for Ha
Gain: 76 Offset: 15 for RGB
Camera temp: -10C
Ha: 74x300" Astrodon 5nm
R: 33x180"
G: 27x180"
B: 30x180"
Total integration time: 10hrs 40min
64x darks per calibration (master from library)
30x flats per calibration
200x bias per calibration (master from library)

Preprocessing:
Batch PreProcessing script to generate calibrated images
StarAlignment
LocalNormalization
ImageIntegration (Linear Fit rejection)
DynamicCrop each master
DBE each master

Ha Processing:
Deconvolution
TGV & MMT noise reduction (via Jon Rista's method)
HistogramTransformation x2
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)" (s=starless photo).
HDRMultiscaleTransform
LocalHistogramEqualization
DarkStructureEnhance Script
MorphologicalTransformation for slight star reduction

RGB Processing:
Linear fit to Blue master
ChannelCombination
SCNR green 50%
TGV and MMT noise reduction (via Jon Rista's method)
ArcsinhStretch a small amount
HistogramTransformation to bring to non-linear
SCNR green 100%
Curves Transformation for saturation
ColorSaturation to saturate blues furthur

Combine Ha and RGB with SHO-AIP script
SCNR green 100%
PixelMath to blend in original RGB stars
CurvesTransformation to neutralize background
PixelMath to blend in more blue reflection nebula from the RGB image

Comments

Author

ak_astro
Andrew Klinger
License: None (All rights reserved)
3050
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The Lagoon Nebula (M8) imaged in HaRGB, 





    
        

            Andrew Klinger