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Contains:  NGC 5198, NGC 5195, Whirlpool galaxy, M 51, NGC 5194, IC 4263, NGC 5169
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M51 Whirlpool Galaxy, 


M51 Whirlpool Galaxy

M51 Whirlpool Galaxy

Technical card

Resolution: 2944x1836

Dates:May 24, 2019

Frames: 44x45"

Integration: 0.6 hours

Avg. Moon age: 20.19 days

Avg. Moon phase: 70.22% job: 2806072

RA center: 202.515 degrees

DEC center: 47.227 degrees

Pixel scale: 2.217 arcsec/pixel

Orientation: 214.763 degrees

Field radius: 1.068 degrees

Data source: Backyard


2 nights of shooting M51 from 2 locations, my backyard and Spruce Knob Lake, WV. Using Takumar 200mm @ f4 and Canon T6 DSLR (effective focal length 324mm @ f6.48) attached to Celestron CG3 EQ2 mount w/single axis motor drive on RA axis.

26x90" (backyard)
10x45" (spruce knob lake)
8x60" (spruce knob lake)

57m40s total exposure time.

Processed with 10 darks and 10 bias. Will add flats to stack on next revision.

Stacked in DSS, removed stacking artifacts in Photoshop, used RNC Color Stretch and Pixinsight for noise removal/unsharp mask. Still a work in progress; next time I will shoot with f-stop down 2 clicks to help combat the purple fringing on some of the brighter stars.



License: None (All rights reserved)


  • M51 Whirlpool Galaxy, 


  • Final
    M51 Whirlpool Galaxy, 




Just the 90 sec frames. In Pixinsight: I used ABE and Color Calibration, Background Neutralization, Histogram Transformation and Curves Transformation. Then ran 2 passes with Deconvolution and ACDNR/TGVDenoise. Imported into Photoshop, merged 10 layers at varying opacities then did Gradient removal by duplicating the image, gaussian blur and curves shadow adjustment, Apply Image (set to Difference). Saved the result.

Sky plot

Sky plot


M51 Whirlpool Galaxy,