Jupiterís Galilean satellites #2 Europa and #3 Ganymede recently initiated a series of four weekly dual shadow transit events. The second will occur during the evening of Saturday October 23 for North American time zones. While Europa is actually transiting Jupiter so will its shadow and that of Ganymede. During these events, #1 Io will undergo both an occultation by Jupiter and an eclipse by Jupiterís shadow.
Iíve created three preview graphics for October 23, one as viewed from above Jupiterís north pole and a second as viewed from Earth. The third is an event timetable. They can be seen by clicking http://www.curtrenz.com/astronomical then going to the page for Superior Planets.
Descriptions and photos of these events would be welcome additions to this thread.