Jupiter with twin shadow transits of Ganymede and Europa, with Io going around behind the plant. Io is the little dot slowly moving towards it in the first two images. The little dot on the limb of the planet in the first picture is Ganymede moving down and to the right. In the last image, Io is not eclipsed and you can see Ganymede and Europa below the plant with their shadows obviously visible on the cloud tops.