Pioneer 4 was a spin-stabilized spacecraft intended as a lunar probe and successfully performed a fly by of the moon at a height of 58983km. Unfortunately it didn't come close enough to trigger its photoelectric sensor. March 3, 1959 at 05:10 UTC · Launch Successful Juno II — National Aeronautics and Space Administration, to Lunar flyby Launch Complex 5, Cape Canaveral SFS, FL, USA The world's 35th orbital launch attempt, and 4th of 1959. Data: Launch Library 2, The Space Devs. Image via The Space Devs.