Io, its shadow, and the Great Red Spot are all near the eastern limb of Jupiter. Europa is off to the right. Image taken at 2017-04-03 05:30 UT from Austin, Texas. Questar 1350/89mm telescope with a Dakin 2x Barlow and ZWO ASI120MC camera at prime focus. 2000 images exposed for 75 msec at a gain of 49. The best 64 images were drizzle stacked in Autostakkert 2 and deconvolved in Lynkeos. Final crop and exposure adjustments in Photoshop..