Here's a photo taken 7-21-2009 3:46UT showing the spot smearing that I mentioned during the club meeting: Sean Walker on S&T http://media.skyandtelescope.com/images/Jup_by_Sean_09-07-21_03-46.jpg in http://www.skyandtelescope.com/observing/ataglance Compare to the July 20 discovery image with more distinct circular impact cloud in http://www.skyandtelescope.com/news/home/51237952.html Here's the UT Sky and Telescope transit times for the GRS with 2:06 added and followed by my original printout from the WinJUPOS software. They is no significant time difference from either source. Source: http://www.skyandtelescope.com/skytel/beyondthepage/41085997.html Times are GRS transit - GRS Transit plus 2:06 - MDT - WinJUPOS Obvious SLC daylight times are omitted. July 23, 7:10 - 9:16 - 3:16am MDT - 2009 Jul 23 09:25 ( 216°, 34°) July 24 3:01 - 5:07 - July 23 11:07pm MDT - 2009 Jul 24 05:16 ( 216°, 13°) July 25 8:48 - 10:56 - 4:56am MDT - 2009 Jul 25 11:03 ( 216°, 27°) July 26 4:39 - 6:45 - 12:45am MDT - 2009 Jul 26 06:54 ( 216°, 27°) July 28 6:17 - 8:23 - 2:23am MDT - 2009 Jul 28 08:32 ( 216°, 33°) July 29 2:08 - 4:14 - July 28 10:14pm MDT - 2009 Jul 29 04:23 ( 216°,  8°) July 30 7:55 - 10:01 - 4:01am MDT - 2009 Jul 30 10:10 ( 216°, 30°) Jupiter system II rotation time is 9:55.  A quarter revolution is about 2.5 hours.  I'm using an hour on either side of the CMII 216 deg transit time as the observing window.