Captured as the GRS was transiting on the evening of 04-Jan-2013 (MST). Io can be seen to the far left. (North is up.)

Telescope configuration: EdgeHD 1400 with the Celestron 0.7x focal reducer (fl=2737, f/7.7); no barlow; Celestron NexImage 5 planetary imaging camera, unbinned, yielding an image scale of 0.17 arc-seconds/pixel; captured with Celestron's iCap version 2.2. Mount: Software Bisque Paramount MX with PEC enabled and ProTrack on. Focused using an AstroZap Bahtinov focus mask.

For the corresponding video, see here:
http://www.youtube.com/watch?v=IO7XyR5no44

video0018 13-01-04 20-41-35-2.jpg