Atlas Agena B | Ranger 4
Ranger 4 was a spacecraft designed to softly impact the lunar surface. Its solar panels were never extended and its sun and earth acquisition system was not initiated due to a failure of a timer in its central computer. It impacted the far side of the Moon on April 26 after 64 hours of flight.
The Atlas LV-3A was a largely unsuccessful configuration until it was given an Agena B upper stage. It was responsible for the launch of Mariner II to Venus and had one of the first engines that could be restarted in orbit.
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Mission Profile
Ranger 4 was a Atlas Agena B LV-3 Agena B mission operated by United States Air Force that lifted off from Launch Complex 12, Cape Canaveral SFS, FL, USA on April 23, 1962. The flight carried its payload on a lunar exploration mission to Lunar Impactor. The launch was a success.