I got out kinda late but captured Io's transit last night. Only an f/10 shot, sorry. Transparency was bad, skeeters were out, time was running short, Olympics were on - you know how it goes...
The first shot was resized to 150% after processing was complete. I overlayed an aligned Io over an aligned Jupiter. The spot on Jupiter was not re-aligned - didn't seem worth it at f/10.
OK, well the last one looked even worse than I remembered it last night. Here's one more that corrects some of the last picture's deficiencies (but introduces others). These are at f/29.