Several spacecraft were built for the Mariner Mars 1964 mission. The ones that were actually launched were referred to as Mariner C-2 and Mariner C-3 until they were renamed Mariner 3 and Mariner 4, respectively. There was also a Proof Test Model (PTM, or Mariner C-1) and a Structural Test Model (STM). This photo shows Mariner C-2 configured for system tests in May 1964. It appears to be in the Spacecraft Assembly Facility, with the observation area at the top of the photo.

Mariner 3 was launched November 5, 1964, but the shroud did not fully eject from the spacecraft, the solar panels did not deploy, and the batteries ran out of power. The problem was fixed on Mariner 4, which began its successful journey to Mars on November 28, 1964.

Documentation found in the Archives does not identify the purpose of the sphere covering the magnetometer during this test.

TAGS:HISTORY, MARINER, MARS, VENUS, SOLAR SYSTEM, MISSION, SPACECRAFT, TECHNOLOGY

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  ABOUT THE AUTHOR

  Julie Cooper, Certified Archivist

  Julie Cooper is a certified archivist who identifies and processes collections for the JPL Archives, and helps researchers find information about the history of JPL.