M81, Spiral Galaxy in Ursa Major

copyright Robert Gendler 2006

To read about M81 click here

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Total Exposure 20 Hours

11 Hours Luminance

9 Hours RGB



Image acquired at the Nighthawk Observatory

Image data acquired remotely using CCDAutoPilot2

RCOS 20RC f/8 Carbon Truss Ritchey-Chrétiens with RCOS Field Flattener / Corrector.

Software Bisque Paramount ME, SBIG STL-11000XM