Mariner 6
Launch: February 24, 1969
Mars flyby: July 31, 1969 (NASA)
Mariner 7
Launch: March 27, 1969
Mars flyby: August 5, 1969 (NASA) (1 h 49 m, 25 feb 1969 año – 16 h 55 m, 27 mar 1969 año)
Descripción:
Mariner 6 and 7 were identical spacecraft arriving at Mars five days apart. Mariner 6 flew by Mars at an altitude of 3,431 kilometers (2,131 miles) and Mariner 7 at 3,430 kilometers (2,131 miles). Mariner 6 returned 75 images, and Mariner 7 126 images. Data from the twin spacecraft helped establish the mass, radius, and shape of Mars and revealed that its southern polar ice cap was composed of carbon dioxide. The spacecraft are now in solar orbits.
https://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1969-030A
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