On October 12th, 2013 at 4:32 UT there will be a rare triple shadow event across Jupiter lasting 65 minutes.
As shown below in the SkyMap Pro map the moons casting the shadows on Jupiter are Io, Europa, and Callisto. Callisto will be casting its shadow on the South Polar Region of Jupiter.
Also below is a sketch made by George Phillips Bond of a three shadow transits on Jupiter on on January 28th, 1848 using the 15" Great Refractor. Using SkyMap Pro I was able to determine that the shadow transits that night were from Io, Europa, and Ganymede.
Obs Alert: Jupiter with 3 shadow transits 10/12/13
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