USGS
Introduction to the Ganymede source data

Ganymede has now been visited by five spacecraft:
 
Mission
Closest encounter date(s)
Type of encounter
Significant Ganymede discoveries
Closest approach (km)
Best image resolution
Pioneer 10
3 December 1973
flyby
non-uniform albedo
approx. 402,700
200 km
Pioneer 11
2 December 1974
flyby
--
739,000 km
367 km
Voyager 1
5 March 1979
flyby
  • cracking and offset of crustal pieces
  • geologically very complex
    		•
    115,000
    2 km
    Voyager 2
    9 July 1979
    flyby
    ?
    62,000
    1 km
    Galileo
    7 December 1995 to 

    31 December 1999
    Jupiter orbiter
  • magnetic field
  • metallic core
    		•
    266 km

    (wG2)
    10 m

    The geologic maps of Ganymede are based on data from the Voyager 1 and Voyager 2 missions. See introductions in map texts for additional mapping source data information.


     
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