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Contains:  M 101, NGC 5457, NGC 5461, NGC 5477
Getting plate-solving status, please wait...
M101 – Pinwheel Galaxy – Apr 2020 v1, 


            Martin Junius
M101 – Pinwheel Galaxy – Apr 2020 v1
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M101 – Pinwheel Galaxy – Apr 2020 v1

Technical card

Dates:April 10, 2020April 13, 2020April 19, 2020April 20, 2020April 21, 2020April 22, 2020

Astronomik L 2: 138x400" (gain: 60.00) -10C bin 1x1
Optolong L-eNhance 2": 45x900" (gain: 120.00) -10C bin 1x1

Integration: 26.6 hours

Darks: ~17

Flats: ~30

Flat darks: ~30

Avg. Moon age: 24.80 days

Avg. Moon phase: 29.47%

Bortle Dark-Sky Scale: 5.00

Mean SQM: 19.87

Temperature: 9.50

Basic astrometry details job: 3482186

RA center: 14h 3' 14"

DEC center: +54° 23' 31"

Pixel scale: 0.862 arcsec/pixel

Orientation: 181.286 degrees

Field radius: 0.691 degrees

Resolution: 4800x3200

Locations: Dellbrück, Köln, NW, Germany

Data source: Backyard


Combined RGB with Astronomik L-2 and Ha with Optolong L-eNhance (R channel).
Severe calibration issues, but managed to salvage all the data.
Drizzle integration, approx. 50% crop.



Martin Junius
License: Attribution-NonCommercial-NoDerivs Creative Commons

Sky plot

Sky plot


M101 – Pinwheel Galaxy – Apr 2020 v1, 


            Martin Junius