Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Contains:  M 101, NGC 5457
Getting plate-solving status, please wait...
M101 - The Pinwheel, 


            Jason Guenzel
M101 - The Pinwheel

M101 - The Pinwheel

Technical card

Resolution: 2217x1688

Dates:June 7, 2016June 8, 2016June 24, 2016June 25, 2016June 28, 2016June 30, 2016July 2, 2016

Blue: 25x180" -20C bin 1x1
Green: 25x180" -20C bin 1x1
Luminance: 158x180" -20C bin 1x1
Red: 25x180" -20C bin 1x1

Integration: 11.7 hours

Darks: ~50

Flats: ~50

Bias: ~256

Avg. Moon age: 17.18 days

Avg. Moon phase: 35.23%

Bortle Dark-Sky Scale: 5.00 job: 1146524

RA center: 14h 3' 11"

DEC center: +54° 21' 21"

Pixel scale: 1.053 arcsec/pixel

Orientation: 87.301 degrees

Field radius: 0.408


This image took a lot of effort to get through. It was my test target for dialing in backfocus early in June and I decided to put in the time to finish it in late June / early July. I'm satisfied with how it turned out considering what I went through, but still am working through a whole host of "issues" with my setup.

There is no doubt it's my personal best M101 by a very wide margin, so that is encouraging.


Rev A - Original
Rev B - Pulled some of the orange cast out of the core
Rev C - Getting happy



Jason Guenzel
License: None (All rights reserved)


  • M101 - The Pinwheel, 


            Jason Guenzel
  • M101 - The Pinwheel, 


            Jason Guenzel
  • Final
    M101 - The Pinwheel, 


            Jason Guenzel

Sky plot

Sky plot


M101 - The Pinwheel, 


            Jason Guenzel