05/08/1969 Mariner 7 makes its closest fly-by of Mars
Mariner 6 and 7 - Video Learning - WizScience.com
Ask an Expert: Mariner 7: Fly-by Mars with a Camera
As part of NASA's wider Mariner program, Mariner 6 and Mariner 7 completed the first dual mission to Mars in 1969. Closest approach for Mariner 7 occurred at a distance of 3,430 kilometers above the Martian surface. This was less than half of the distance used by Mariner 4 on the previous US Mars flyby mission.