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Contains:  IC 4263, M 51, NGC 5169, NGC 5194, NGC 5195, NGC 5198, Whirlpool galaxy
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M51 from Denver, Colorado (2017), 


            Ken Sturrock
M51 from Denver, Colorado (2017)
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M51 from Denver, Colorado (2017)

Technical card

Basic astrometry details job: 1488443

RA center: 13h 29' 51"

DEC center: +47° 11' 27"

Pixel scale: 1.308 arcsec/pixel

Orientation: 88.915 degrees

Field radius: 0.724 degrees

Resolution: 3100x2500


M51 taken from my backyard near Denver, Colorado.

I ended up using about 24 hours of data, which was only half of what I originally took.

Even though I collect a lot of frames, much of it is sub-par due to seeing and the occasional high clouds blocking the target but also reflecting light pollution.

I was hurt by having less Ha and Luminance data to stand against a larger amount of R,G & B data, so I had to get a little creative when it came time to combining color channels - without introducing noise from the lesser-time channels.. The Ha ended up just getting mixed in with R. The Luminance was mixed with extracted lightness from the RGB to quiet it down a bit more, then blended back after an attempt at deconvolution.

I'm still fighting my subtle ICX814-related background "tiger stripes", but mostly controlled them through PixelMath.



Ken Sturrock
License: Attribution-NonCommercial Creative Commons

Sky plot

Sky plot


M51 from Denver, Colorado (2017), 


            Ken Sturrock