Repost per discussion at tonight's club meeting.  These are predicted transit times for the Jupiter comet impact hole in the Jovian atmosphere: WinJUPOS 8.0.4 (Jupiter), C.M. transit times, 2009/07/20  14:34 Object longitude: L2 = 216.0° +  0.0000°/d * (T - 2009 Jul 19.5) Time interval: 2009 Jul 20.0 ... 2009 Jul 31.0 Only if celestial body is visible Geographic longitude and latitude: -111 00, +42 00 Output format: Date UT (C.M. of System 2, Altitude) 2009 Jul 20   11:56 ( 216°, 24°) 2009 Jul 21   07:47 ( 216°, 30°) 2009 Jul 23   09:25 ( 216°, 34°) 2009 Jul 24   05:16 ( 216°, 13°) 2009 Jul 25   11:03 ( 216°, 27°) 2009 Jul 26   06:54 ( 216°, 27°) 2009 Jul 28   08:32 ( 216°, 33°) 2009 Jul 29   04:23 ( 216°,  8°) 2009 Jul 30   10:10 ( 216°, 30°) Amateur discovery image Anthony Wesley, Australia, 7-19-2009 http://www.acquerra.com.au/astro/gallery/jupiter/20090719-155537/large.jpg