When the spot transits tonight at 7-21-2009 07:47UT (1:47am),  Jupiter will be at az 148 alt 29 for SLC.  The CMII system rotates every 09:55 hours or about 2 hours for every 1/4 turn. So the spot should remain visible for another hour or 1 1/2 hours after the transit. Clear Skies - Kurt