NGC4725 and NGC4712 Galaxies in Coma Berenices (Alastairmk)

NGC4725 and NGC4712 Galaxies in Coma Berenices

NGC 4725 is a barred spiral galaxy that is part of the Coma Group. The other spiral galaxy in the image is NGC 4712 and there are about 10 other tiny galaxies in the image. The data were acquired at my backyard observatory over 10 nights in April and May 2023.

After eliminating 214 of the lowest quality frames, total integration time is 10.3 hours of RGB subframes comprising:
R 95 x 120s
G 110 x 120s
B 102 x 120s

Processing was in Pixinsight. WBPP was followed by NormalizeScaleGradient and two DBE runs to reduce light pollution gradients on the masters for each filter. After combining the RGB masters, and using SpectrophotometricColorCalibration, the composite image was sharpened with BlurX and then NoiseX. Unfortunately there were some nasty crater like artifacts in the background, probably dust motes not corrected during calibration due to mirror or filter shifts. These were eliminated by creating a starless image with StarX, masking all the galaxies with the GAME script and applying 8 layer MMT to the background aggressively to the higher level structures. Another time I might try creating a synthetic flat and may revise this image if time permits. The challenge was to preserve some of the faint outer detail of the main galaxy while eliminating background artifacts.

After stretching the starless image and star images with GeneralizedHyperbolicStretch, the stars were added back using PixelMath with some gentle adjustment using CurvesTransformation on the background. The image still required some sharpening using UnsharpMask and adjustments to the hue of the galaxies with CT. Final adjustment was to further sharpen and denoise with Topaz Denoise AI. In summary, some messy processing to rescue an image from data marred with wildfire smoke and high altitude clouds, light pollution gradients and some poor tracking.

Light Polluted skies
NOVAC

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Status	Basic success
Started	...
Astrometry.net job	8353699
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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NGC4725 and NGC4712 Galaxies in Coma Berenices

NGC4725 and NGC4712 Galaxies in Coma Berenices

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NGC4725 and NGC4712 Galaxies in Coma Berenices

NGC4725 and NGC4712 Galaxies in Coma Berenices

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