Big Joe 1 (Atlas-10D) launched an uncrewed boilerplate Mercury capsule from Cape Canaveral, Florida on 9 September 1959. The purposes of the Big Joe 1 were to test the Mercury spacecraft ablative heat shield, afterbody heating, reentry dynamics attitude control and recovery capability. It was also the first launch of a spacecraft in Project Mercury.
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nor main engine ignition followed normal vernier ignition. There was no booster or stand damage. The second FRF was successfully completed on 3 September 1959, with normal ignition, transition to main stage and shutdown by the engine timer after approximately 19 seconds of running time.