USGS

INTRODUCTION to the MERCURY SOURCE DATA

The maps of Mercury on this site are based on data from the single Mariner 10 mission which made three flyby encounters with Mercury in 1974 and 1975.
 
Mission
Encounter dates
Type of encounter
Significant discoveries
Closest approach
Best resolution
Mariner 10
29 March 1974
flyby
  • first detailed views
  • highly cratered surface 
  • Caloris impact basin
  • 704 km
    120 m
    Mariner 10 21 September 1974
    flyby
    47,000 km
    1 km
    Mariner 10
    16 March 1975
    flyby
    south polar area imaged
    327 km
    ?



     
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