Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  NGC 5451  ·  NGC 5455  ·  NGC 5457  ·  NGC 5461  ·  NGC 5471
Pinwheel Galaxy, M101, 


            James Schellenberg
Pinwheel Galaxy, M101
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Pinwheel Galaxy, M101

Technical card

Imaging telescopes or lenses: Celestron 11" EdgeHD

Imaging cameras: Canon 6D Modded

Mounts: iOptron CEM60

Software: Sequence Generator Pro  ·  PHD2. for guiding  ·  DSS & Photoshop

Accessory: Celestron OAG with QHY5iii 174 guide camera

Dates:July 1, 2019

Frames: 50x300"

Integration: 4.2 hours

Avg. Moon age: 28.10 days

Avg. Moon phase: 2.29%

Basic astrometry details

Astrometry.net job: 3653936

RA center: 14h 3' 14"

DEC center: +54° 21' 43"

Pixel scale: 0.490 arcsec/pixel

Orientation: 0.443 degrees

Field radius: 0.282 degrees

Resolution: 3235x2587

Locations: Mt. Pinos, Frazier Park, CA, None

Data source: Traveller


Located in the constellation Ursa Major, this galaxy is approximately 25 million light-years from Earth. It's diameter is roughly twice that of our Milky Way and contains an estimated one trillion stars.
I imaged this galaxy on July 1, July 30 and August 1 of 2019 at Mt. Pinos, CA. As described below in the comments, I was not happy with the original results and reprocessed the data set (50, 5 minute sub-frames) in the spring of 2020.
In July 2020, I cropped the image and resubmitted.



  • Pinwheel Galaxy, M101, 


            James Schellenberg
  • Final
    Pinwheel Galaxy, M101, 


            James Schellenberg

Sky plot

Sky plot


Pinwheel Galaxy, M101, 


            James Schellenberg