Hi all
This animation has been a long time coming. Back on the 5th July 2009, Ganymede and Callisto had a close approach - no occultation unfortunately, but it was still great to see them so close together.
Ganymede, at 5,200km diameter (1.7 arcseconds) and Callisto at 4,800 km diameter (1.6 arcseconds) are both over 635 million km away. The seeing was only just above average, but both moons show consistent albedo features throughout many frames of the animation.
The animation covers just over 2 hours of elapsed time. View the image and animation here:
Ganymede and Callisto Close Approach Animation
A single image from the animation is attached.
Thanks for looking.