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Contains:  M 101, NGC 5457
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M101 (Pinwheel Galaxy), 


            Joel Shepherd
M101 (Pinwheel Galaxy)
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M101 (Pinwheel Galaxy)

Technical card

Dates:March 2, 2019March 3, 2019March 4, 2019

Baader Planetarium B 1.25": 20x300" bin 1x1
Baader Planetarium B 1.25": 12x300" -10C bin 1x1
Baader Planetarium G 1.25": 14x300" bin 1x1
Baader Planetarium G 1.25": 18x300" -10C bin 1x1
Baader Planetarium R 1.25": 24x300" bin 1x1
Baader Planetarium R 1.25": 4x300" -10C bin 1x1

Integration: 7.7 hours

Avg. Moon age: 26.71 days

Avg. Moon phase: 9.25%

Bortle Dark-Sky Scale: 6.00

Basic astrometry details job: 2593976

RA center: 14h 3' 12"

DEC center: +54° 21' 54"

Pixel scale: 0.970 arcsec/pixel

Orientation: 21.736 degrees

Field radius: 0.274 degrees

Resolution: 1593x1264

Locations: Home, Seattle, WA, United States

Data source: Backyard


Taken over three nights in early March. The second night was pretty unproductive: thin high clouds made most of the lights unusable. I also sense there is some faint nebulosity that I simply couldn't tease out without either taking a lot more lights or imaging under much darker skies. Nonetheless, for RGB under city lights I'm pleased with the amount of detail that did come through.

M101 is a large spiral galaxy approximately 21 million light-years distant. It is a galaxy's galaxy: approximately twice the diameter of the Milky Way, with roughly a trillion stars and numerous areas of new star generation.



Joel Shepherd
License: Attribution Creative Commons

Sky plot

Sky plot


M101 (Pinwheel Galaxy), 


            Joel Shepherd