On October 15, 2023, NASA’s Juno spacecraft flew past Jupiter’s volcanic moon Io and acquired these amazing images using its JunoCam camera. The closest of these images (first image in the second row) was acquired from a distance of only 11,680 kilometers (7,260 miles). Many of the images in this montage of fifteen JunoCam images are the best resolution images acquired of Io in 22 years when NASA’s Galileo spacecraft performed one of its final satellite encounters. Images such as these will provide Io research with plenty of analysis work for years to come. They cover Io’s anti-Jovian hemisphere before going over Io’s north polar region and settling out over the satellite’s sub-Jovian hemisphere.
These images reveal new details about Io’s north polar region an area dotted with non-volcanic mountains, some as tall as 6000 meters (20,000 feet). Conversely, relatively few volcanoes are visible in this region, a relationship seen in other regions of Io, where concentrations of mountains and volcanoes seem to be anti-correlated. The regions photographed also seem to be relatively stable over the last 16–22 years, when Io was last imaged by Galileo and New Horizons. In addition to previously noted changes at Volund, Chors Patera, and a lava flow east of Girru Patera, the biggest notable change is a large flow field that has formed out of the southern end of Surt.
Each image has been aligned using a control point network using USGS’s Integrated Software for Imagers and Spectrometers (ISIS) and map projected to a point-perspective projection, providing the least amount of distortion compared to the original up-close images). Image scales vary from 29.6 kilometers (18.4 miles) to 7.9 kilometers (4.9 miles) per pixel.