Pioneer 4
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Pioneer 4 is an American spin-stabilized uncrewed spacecraft that was launched as part of the Pioneer program on a lunar flyby trajectory and into a heliocentric orbit making it the first probe of the
Pioneer 4 flight spare
Diagram of Pioneer 4
The Pioneer 4 probe is inspected by (left to right) Dr. Wernher von Braun, payload engineer John Casani and Dr. James Van Allen.
Pioneer IV flight spare
Juno II
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Juno II is an American space launch vehicle that used during the late 1950s and early 1960s. It was derived from the Jupiter missile, which was used as the first stage.
Pioneer 4
…its reliability and signal strength. The probe had S/N #4, with probe #3 recalled from launch due to technical issues. Pioneer 4 was launched with a Juno II launch vehicle, which also launched Pioneer 3. Juno II closely resembled the Juno I (Jupiter-C based) vehicle that launched Explorer 1. Its first stage…
Juno II on pad
Juno II with Pioneer 3 payload
Launch 1, Juno II AM-11 with Pioneer 3
Launch 2, Juno II AM-14 with Pioneer 4