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Contains:  IC 435, NGC 2024, NGC 2023, Horsehead nebula, IC 434, IC 432, IC 431, NGC 1990, The star Alnitak (ζOri), The star σOri, The star Alnilam (εOri), Part of the constellation Orion (Ori)
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Flame and Horsehead Nebula, 





    
        

            Andrew Klinger
Flame and Horsehead Nebula

Flame and Horsehead Nebula

Technical card

Imaging telescope or lens:William Optics GT-81

Imaging camera:Canon EOS 600D / Rebel T3i

Mount:Orion Sirius EQ-G (HEQ5)

Guiding telescope or lens:Orion 50 mm Guide Scope

Guiding camera:Orion Star Shoot Auto Guider

Focal reducer:William Optics Flat 6A

Software:PHD2PixInsight

Resolution: 4888x3335

Dates:Jan. 29, 2017

Frames: 25x480" ISO800

Integration: 3.3 hours

Darks: ~32

Flats: ~30

Bias: ~200

Avg. Moon age: 1.46 days

Avg. Moon phase: 2.40%

Bortle Dark-Sky Scale: 3.00

Astrometry.net job: 2052942

RA center: 84.976 degrees

DEC center: -2.592 degrees

Pixel scale: 2.288 arcsec/pixel

Orientation: 91.559 degrees

Field radius: 1.880 degrees

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

Description

Data acquired 1-22-17, 1-25-17, and 1-29-17 in Atoka, OK
Scope: William Optics GT81 w/ 0.8x reducer (382mm focal length at f/4.7)
Mount: Orion Sirius EQ-G
Guidescope: Orion 50mm guidescope
Guiding camera: StarShoot Autoguider
Imaging camera: Canon t3i (unmodified)

ISO800
25x480" lights
(3hr 20min total integration time)
32x darks per subset
30x flats per subset
200x bias

Processing Details:

PixInsight:
BatchPreProcessing->ImageIntegration->DrizzleIntegration->DynamicCrop->DynamicBackgroundExtraction->BackgroundNeutralization->ColorCalibration->Deconvolution->MultiscaleLinearTransform for NR->HistogramTransformation

(almost all of the processing from here on uses masks crafted with PixInsight and Photoshop to edit specific areas of the image)

Made a copy of image to create a semi-starless version:
Removed stars using several iterations of MultiscaleMediumTransform and MorphologicalTransformation->Pushed nebulosity with PixelMath expression "1-(1-$T)*(1-$T)"

Combined starless version with 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->CurvesTransformation to selectively push dusty regions->HistogramTransformation->SCNR green->ColorSaturation tool on entire image->ColorSaturation tool to target specific nebulosity colors->CurvesTransformation to darken background->ACDNR->Resampled to 50% for web posting

Comments

Author

ak_astro
Andrew Klinger
License: None (All rights reserved)
2861
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Histogram

Flame and Horsehead Nebula, 





    
        

            Andrew Klinger