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Contains:  IC 4715, Omega nebula, M 17, NGC 6618, IC 4701, M 8, Lagoon nebula, Hourglass nebula, NGC 6523, NGC 6526, Trifid nebula, M 20, NGC 6514, M 7, NGC 6475, NGC 6383, NGC 6357, NGC 6334, NGC 6281, IC 4605, rho Oph nebula, IC 4604, IC 4592, The star πSco, The star Media (δSgr), The star Lesath (υSco), The star Graffias (β1Sco), The star Sabik (ηOph), The star Dschubba (δSco), The star εSco, The star Kaus Australis (εSgr), The star Shaula (λSco), The star Antares (αSco), Part of the constellation Scorpius (Sco), Part of the constellation Sagittarius (Sgr), Part of the constellation Ophiuchus (Oph)
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Milky Way Core to Rho Ophiuchi, 





    
        

            Andrew Klinger
Milky Way Core to Rho Ophiuchi

Milky Way Core to Rho Ophiuchi

Technical card

Resolution: 4010x2769

Dates:May 12, 2018

Frames:
ZWO B 1.25": 10x180" (gain: 76.00) -10C bin 1x1
ZWO G 1.25": 10x180" (gain: 76.00) -10C bin 1x1
ZWO R 1.25": 9x180" (gain: 76.00) -10C bin 1x1

Integration: 1.4 hours

Darks: ~64

Bias: ~200

Avg. Moon age: 26.33 days

Avg. Moon phase: 11.14%

Bortle Dark-Sky Scale: 3.00

Astrometry.net job: 2060629

RA center: 258.310 degrees

DEC center: -27.413 degrees

Pixel scale: 30.987 arcsec/pixel

Orientation: 358.467 degrees

Field radius: 20.975 degrees

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

Data source: Unknown

Description

Equipment:
Lens: Rokinon 24mm f/1.4 (stopped to f/4)
Mount: Orion Sirius EQ-G (HEQ-5)
Imaging camera: ZWO ASI1600MM-Cool

Software:
SGP
PHD2
CdC
PixInsight

Acquisition:
Location: Atoka, Oklahoma (Bortle 3)
Dates: 5/12/18
Gain: 76 Offset: 15
Camera temp: -10C
R: 9x180"
G: 10x180"
B: 10x180"
Total integration time: 1hr 27min
64x darks per calibration (master dark in library)
No flats (had issue with them)
200x bias (master bias in library)

Preprocessing:
Batch PreProcessing script to generate calibrated images
StarAlignment to register all frames to a reference
DynamicCrop each master
DBE on each master

RGB processing:
BackgroundNeutralization
ColorCalibration
SCNR green 50%
TGV and MMT noise reduction (via Jon Rista's method)
ArcsinhStretch and HistogramTransformation
SCNR green 100%
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 expression but F=0.2 (s=starless photo).
CurvesTransformation for saturation
ExponentialTransformation with a mask to further push faint nebulosity
ColorSaturation to selectively saturate blues
MorphologicalTransformation for slight star reduction

Comments

Author

ak_astro
Andrew Klinger
License: None (All rights reserved)
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Milky Way Core to Rho Ophiuchi, 





    
        

            Andrew Klinger