I'm stacking a lot of frames along the way to making an animation of the Europa/Io occultation from the 12th.
Each frame of the animation is the best 250 out of 1200 frames, and I kept seeing a persistent set of light and dark patterns on Europa in each frame, so in the end I gave in and stacked together all the finished animation frames (24 frames so far) centered just on Europa and here is the result.
I'll do this again when I'm finished all 64 frames of the animation, but I'm reasonably confident that this is real and not imagined... this represents the best 5000 out of 28000 frames...
Europa is 0.9" in diameter, the smallest of the galileans.
Here's the last one for now - this is 32 frames of the animation realigned and stacked, and I've done both Europa and Io so you can see the difference.
Io is dark at the poles and so it doesn't appear round. Europa still shows much the same set of features.
So this is 8000 frames stacked out of 38400. Io is 1" in diameter.
Worth remembering that this was recorded as part of the Io/Europa occultation that happened at 6.26am... The portion I've processed so far would be from 6.05am to about 6.20am or so, well past the best seeing for the night. If I'd recorded this an hour earlier then the results would have been much much better :-)
