This image of the south polar region of the Jovian satellite Callisto was taken in twilight by the Galileo spacecraft on its eighth orbit around Jupiter. Note that many of the craters are not as sharp in appearance as the two large craters near the bottom of the image. This is an indication that some process has eroded the craters since their formation. North is toward the top of the image. Callisto Asgard C allisto is the most distant of the four large moons of Jupiter.
North is to the top of the picture.
The rings are tectonic features with scarps near the central zone and troughs at the outer margin. The bright-rayed crater Burr is much younger. The false color image was taken by the NIMS Infrared Mapping Spectrometer 90 minutes before the closest approach. It shows surface compositional differences, white color meaning more ice, and blue, less. The large bright area is the palimpsest or center of Asgard.