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Contains:  NGC 5195, Whirlpool galaxy, M 51, NGC 5194
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M51 - The Whirlpool Galaxy, 





    
        

            Andrew Klinger
M51 - The Whirlpool Galaxy

M51 - The Whirlpool Galaxy

Technical card

Resolution: 700x500

Dates:May 31, 2019

Frames:
ZWO B 1.25": 6x180" (gain: 76.00) -20C bin 1x1
ZWO G 1.25": 6x180" (gain: 76.00) -20C bin 1x1
ZWO L 1.25": 6x180" (gain: 76.00) -20C bin 1x1
ZWO R 1.25": 6x180" (gain: 76.00) -20C bin 1x1

Integration: 1.2 hours

Darks: ~64

Bias: ~200

Avg. Moon age: 26.57 days

Avg. Moon phase: 9.60%

Bortle Dark-Sky Scale: 3.00

Astrometry.net job: 2724536

RA center: 202.469 degrees

DEC center: 47.196 degrees

Pixel scale: 2.026 arcsec/pixel

Orientation: 93.923 degrees

Field radius: 0.242 degrees

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

Data source: Traveller

Description

While waiting for my main target to rise I captured a couple hours of light on M51 for fun. As you can imagine this is an enormous crop on my system, but small intricacies in the spiral arms are still somewhat visible.

Equipment:
OTA: William Optics GT81 w/Flat6A (382mm fl at f/4.7)
74mm aperture stop-down ring (brings scope to f/5.2)
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: Atoka, OK (Bortle 3)
Dates: 5/31/19
Gain: 76 Offset: 15
Camera temp: -20C
L: 6x180"
R: 6x180"
G: 6x180"
B: 6x180"
Total integration time: 1hr 12min
64x darks per calibration (master from library)
200x bias per calibration (master from library)

Preprocessing:
Batch PreProcessing script to generate calibrated images
StarAlignment to register all frames to the reference
ImageIntegration
DynamicCrop each master

RGB Processing:
TGV and MMT noise reduction (via Jon Rista's method)
LinearFit to Blue
ChannelCombination
BackgroundNeutralization
ColorCalibration
ArcsinhStretch x3
HistogramTransformation
SCNR green
CurvesTransformation for saturation

L Processing:
Deconvolution
TGVDenoise
Arcsinhstretch x2
HistogramTransformation
MultiscaleLinearTransform for sharpening

Combined L and RGB with LRGBCombination tool
CurvesTransformation to balance background
MorphologicalTransformation to reduce star sizes
UnsharpMask to harden the stars a tad

Comments

Author

ak_astro
Andrew Klinger
License: None (All rights reserved)
4521
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M51 - The Whirlpool Galaxy, 





    
        

            Andrew Klinger