M101, Pinwheel Galaxy

Click on the image for the high res version - or click here for a processing focused on the galaxy (see also below)

The Pinwheel Galaxy, M101, is a large and faint galaxy in Ursa Major. It's viewed face on and the spiral structure is quite distorted. For a full field and full res version, click on the image. Thanks to the high resolution of the telescope and CCD, many details are visible at 100% (or even more).

Crop of the central part, showed at 200% resolution

Technical Data
Optics TEC 140
Focal Length
1011 mm
Focal Ratio f/7.2
Exposure Time 5 h 20 min (single exp of 10 min), LRGB 150:60:40:70 min
Location Capanne di Cosola (AL, Italian Apennines) at 1500 m height
15 March 2013
Mount Gemini G-41
Tracking Lodestar on an 80mm f/5 refractor
Temperature and humidity T= -10 °C, RH=40%
Sky brightness at zenith (with SQM-L) 21.3 mag/arcsec^2
Notes North at top.

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