Well 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.
Click the image below to view the 15 frame animation which covers just over 2 hours of elapsed time.
Please read on to find out more about the capture and processing.
It’s taken a long time to go through the data – something else always came up, but I’ve finally got around to finishing processing the individual avi’s and compiling the animation.
I captured 15 lots of RGB data at 30fps, and captured for 1 minute in each channel. I stacked 250 frames from each channel using Registax, and compiled the RGB images using Photoshop. The images were prepared and aligned for the animation using Photoshop, and Jasc Software Animation Shop 3 was used to create the animation.
Thanks for looking.