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Contains:  NGC 5477, M 101, NGC 5457
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M101 the Pinwheel, 


            Bret Waddington
M101 the Pinwheel

M101 the Pinwheel

Technical card

Resolution: 4045x3200

Dates:March 25, 2019March 30, 2019

66x180" (gain: 120.00) -10C bin 1x1
47x240" (gain: 50.00) -10C bin 1x1

Integration: 6.4 hours

Darks: ~30

Flats: ~30

Bias: ~70

Avg. Moon age: 21.90 days

Avg. Moon phase: 52.32%

Bortle Dark-Sky Scale: 4.00 job: 2617854

RA center: 210.806 degrees

DEC center: 54.347 degrees

Pixel scale: 0.853 arcsec/pixel

Orientation: 330.311 degrees

Field radius: 0.611 degrees

Locations: Driveway, Davis, Illinois, United States

Data source: Backyard


Testing new mount. Dither did not work correctly first night and walking noise is noticeable in the galaxy. On the second night I increased the dither amount and it took care of the problem. Still having issues trying to calibrate out the starburst from the sony sensor. Cropped and used burn tool to hide it. Trying to find a solution to this problem I used a lower gain and shot new dark frames the second night. I also tried several different sets of flats, tried Linear fit clipping and Winsorized Sigma, nothing seems to work for me.



Bret Waddington
License: None (All rights reserved)

Sky plot

Sky plot


M101 the Pinwheel, 


            Bret Waddington

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Cloudy Nights