JunoCam tracks Jupiter's moons in the "Marble Movie"
This 46-frame animation covers about 6 weeks of Juno's first long orbit of Jupiter, from July 10 to August 21, 2016. Each frame contains a stack of one Io's orbit worth of moon images; each frame advances in time from the previous one by 21 hours, or half an Io orbital period.
This image is in the public domain.
Original image data dated on or about August 21, 2016