PIA01659 Full Res. This image shows a mosaic of Buto Facula, a so-called 'palimpsest' situated in Marius Regio on Jupiter's largest satellite Ganymede.
Palimpsests are bright, nearly circular patches that are believed to be remnant impact features.
They preferentially, but not exclusively, occur in Ganymede's more densely cratered, older, dark terrain units and may also be found on Ganymede's outer neighbor Callisto. The sun illuminates the scene from the right at low angle, so morphological features are accentuated by long shadows. North is pointing towards the top of the mosaic. The lower resolution context in the background is given by Voyager images from 1979 when that spacecraft passed through the Jovian system at far greater distance from Ganymede than Galileo. The image center is about 12 degrees north of Ganymede's equator at a longitude of 24 degrees East.