The GRS is presently experimenting great changes, expelling flakes towards SEB and apparently reducing its diameter. It is considered the greatest changes in the last 100 years. The image was captured a few days past the opposition.
In Io, some albedo marks.

Newtonian GSO 305 mm f/5 + PowerMate 5 X ; camera ZWO ASI224MC,

11200 frames captured, processed the best 2500 frames with AS!3, Registax and Photofiltre