Pinwheel Galaxy, M101
My 2nd image of this galaxy
Copyright 2011
Larry Phillips
M101 (NGC 5457), a spiral galaxy in the constellation Ursa Major

Distance: 27 million light years
Size: 170 thousand light years across
Camera: SBIG ST-10XME
Telescope: Astrophysics Starfire 140 EDT F7.5
Mount: Astro-Physics Mach1 GTO with Advanced Telescope Systems portable pier
Images: 42 subexposures of 10 minutes each with 6 luminance, 11 red, 16 green, and 9 blue for a total
                  of 7 hours
Date: May 2010
Software: Camera, mount, and guider control - CCD Commander & MaximDL, calibration and stacking - CCDStack, further processing in Photoshop CS4.