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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

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 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


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


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)

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

Ha Processing:
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).
DarkStructureEnhance Script
MorphologicalTransformation for slight star reduction

RGB Processing:
Linear fit to Blue master
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



Andrew Klinger
License: None (All rights reserved)

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The Lagoon Nebula (M8) imaged in HaRGB, 


            Andrew Klinger