Over a period of about 1.5 hours and beginning at 18:08 UT (1:08 pm CDT) on Tuesday 3 June three of Jupiter’s largest moons, Callisto, Europa, and Ganymede, will all have their respective shadow crossing the planet’s disk in a ‘triple shadow transit’ event. While a triple shadow transit is somewhat rare shadow transits of Jupiter are a nearly monthly event during the months that Jupiter is in either the morning skies rising before the Sun, or the evenings skies setting after the Sun, where Jupiter is now currently located.
The next shadow transit, and the last one for a few months, is a double shadow transit occurring on the 10th. Why the last one for a while? Jupiter moves into conjunction with the Sun during July and until next September when Jupiter reappears on the other side of the Sun as a morning planet we will be unable to see either the planet or any shadow transits.
Click here to go to the Qué tal in the Current Skies web site for more observing information for this month.