Tom, Very cool. I wonder if Galileo ever observed something like this? Bernard -----Original Message----- From: az-observing-bounce@xxxxxxxxxxxxx [mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of Tom Polakis Sent: Friday, January 23, 2015 6:42 PM To: AZ-Observing@xxxxxxxxxxxxx Subject: [AZ-Observing] Time-lapse of Callisto Eclipsing Ganymede this Morning As we pass through the orbital plane of Jupiter's moons, there are plenty of mutual events, both occultations and eclipses. The deepest and most favorable of these events occurred this morning, when Callisto's shadow covered more than 80 percent of Ganymede. The geometry was such that the distance between Callisto and Ganymede was 1.6 million miles at the time of the eclipse. Seeing was very unsteady this morning, but I gave it a shot with the webcam this morning. I used a 15-inch with a 2x Barlow lens, and further doubled the scale in the post-processing. This time-lapse series runs 19 minutes, and used a 1-minute interval between the finished frames. The shadow passed north of (above) center, which is evident in the sequence. I'd complain more about the seeing conditions on this January night, but it could be worse; we could be in Buffalo. http://www.pbase.com/polakis/image/158918439/original Tom -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list. -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.