PIA01987: Ganymede
 Target Name:  Ganymede
 Is a satellite of:  Jupiter
 Mission:  Voyager
 Spacecraft:  Voyager 1
 Instrument:  VG ISS - Narrow Angle
 Product Size:  100 x 100 pixels (w x h)
 Produced By:  JPL
 Producer ID:  P21150
 Addition Date:  1999-07-23
 Primary Data Set:  Voyager EDRs
 Full-Res TIFF:  PIA01987.tif (13.4 kB)
 Full-Res JPEG:  PIA01987.jpg (1.753 kB)

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Original Caption Released with Image:

Voyager 1 took this picture of Jupiter's satellite Ganymede from a distance of 5 million miles (8.025 million kilometers) early on the morning of Feb. 26. Ganymede is the largest of Jupiter's 13 satellites. It is slightly larger than the planet Mercury, and has a density about twice that of water. That leads scientists to believe it is composed of a mixture of rock and ice. Ganymede is about four times brighter than Earth's Moon, and ground-based observations indicate a surface of water frost or ice. Details of the surface are not easily interpreted. The bright spot near the center of the picture is five times brighter than the Moon, and may contain more than surrounding areas. The bright pattern around the spot reminds scientists of ray craters on the Moon and Mercury, and the area may in fact be an impact crater that has exposed fresh, underlying ice. Further interpretation will require higher-resolution pictures. This color photo was taken through blue, green and orange filters and was assembled in the Image Processing Lab at Jet Propulsion Laboratory. JPL manages and controls the Voyager project for NASA's Office of Space Science.

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