Images/videos may be used by the media and the public for educational and informational purposes only

Stellar Reference Unit (SRU)


Stellar Reference Unit (SRU) image of Io Image Courtesy of NASA/JPL-Caltech/SwRI Juno’s Radiation Monitoring Investigation collected this image of Jupiter’s moon Io with Juno’s Stellar Reference Unit (SRU) star camera shortly after Io was eclipsed by Jupiter at 12:40:29 (UTC) Dec. 21, 2018. Io is softly illuminated by moonlight from another of Jupiter’s moons, Europa. The brightest feature on Io is suspected to be a penetrating radiation signature. The glow of activity from several of Io’s volcanos is seen, including a plume circled in the image.