The NIMS observation of a small section of the Asgard terrain reveals compositional variations over the surface of Callisto. Red indicates a high concentration of clean ice at the floor of an impact crater while blue shows large amounts of non-ice material on the surrounding surface.
The data in these images were taken on November 4, 1996, at a distance of 111,891 kilometers (69,900 miles) by the Solid State Imaging (CCD) system and 17,920 kilometers (11,200 miles) by the Near Infrared Mapping Spectrometer aboard NASA's Galileo spacecraft during its third orbit around Jupiter. The area seen in the SSI image is 440 kilometers by 440 kilometers across at 1.1 kilometers per picture element (pixel) resolution, centered near 17 North, 153 West, while the resolution for the NIMS observation is 8 kilometers per pixel.
The Jet Propulsion Laboratory, Pasadena, CA manages the mission for NASA's Office of Space Science, Washington, DC.
This image and other images and data received from Galileo are posted on the World Wide Web, on the Galileo mission home page at URL http://www.jpl.nasa.gov/ galileo.