On Tuesday evening, March 26th, 2013, in the Eastern portion on North America, only one Galilean moon will be visible staring at 8:41 PM.
Here are the approximate times of the satellite events. Note they were generated for the Northeastern portion on North America so the time maybe be different for you depending upon your observing location.
7:47 PM Ganymede (III) Occultation disappearance
8:20 PM Europa (II) Transit start
8:41 PM Io (I) Occultation disappearance
10:12 PM Ganymede (III) Occultation reappearance
10:43 PM Europa (II) Shadow transit start
10:48 PM Europa (II) Transit end
12:04 AM Io (I) Eclipse reappearance
I observed this event once before in August of 1976, although in that case I did not have an advanced warning. I had set up my Criterion RV-6 reflector to observe Jupiter and was surprised to see that only one moon was visible. I have often wondered since then if I would get the chance to observe this event again.
Note that Jupiter with only one Galilean moon visible will occur again on April 3rd, 2013 at 12:03 AM for all of North America except the East.
Jupiter with only one Galilean moon visible 03/26
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