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Contains:  M 31, Great Nebula in Andromeda, NGC 224, M 32, NGC 221, M 110, NGC 205
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M31 - Andromeda Galaxy, 





    
        

            Andrew Klinger
M31 - Andromeda Galaxy

M31 - Andromeda Galaxy

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: 4970x3205

Dates:Nov. 30, 2016

Frames: 25x480" ISO800

Integration: 3.3 hours

Darks: ~32

Flats: ~90

Bias: ~200

Avg. Moon age: 0.88 days

Avg. Moon phase: 0.88%

Bortle Dark-Sky Scale: 3.00

Astrometry.net job: 2052938

RA center: 10.687 degrees

DEC center: 41.271 degrees

Pixel scale: 2.287 arcsec/pixel

Orientation: 269.754 degrees

Field radius: 1.879 degrees

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

Description

Data acquired 11-23-16, 11-28-16, and 11-30-16 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
16x60" lights for the core
(3hr 36min total integration time)
32x darks
90x flats
200x bias

Processing Details:

PixInsight:
Preparing each subset for combination:
BatchPreProcessing->ImageIntegration->DrizzleIntegration->DynamicCrop->BackgroundNeutralization->ColorCalibration

Combined each subset using HDRComposition

BackgroundNeutralization->Deconvolution->MultiscaleLinearTransform for NR->HistogramTransformation->HDRMultiscaleTransform

Made a copy of image to create a semi-starless version:
Removed stars using a StarMask and several iterations of MultiscaleMediumTransform and MorphologicalTransformation->CurvesTransformation

Photoshop:
Combined the starless version into the image as a luminance layer (40% opacity) using luminosity layer blending style.

PixInsight:
LocalHistogramEqualization->HistogramTransformation->SCNR green->CurvesTransformation for slight saturation boost->ColorSaturation tool for specific saturation boosts of galaxy->one final CurvesTransformation->Resampled to 50% for web posting.

Comments

Author

ak_astro
Andrew Klinger
License: None (All rights reserved)
6323
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M31 - Andromeda Galaxy, 





    
        

            Andrew Klinger