 Transit 4B was among several satellites which were inadvertently damaged or destroyed in a nuclear explosion, specifically the United States Starfish Prime high-altitude nuclear test on July 9, 1962 and subsequent radiation belt.Transit 5A3 and Transit 5B-1 (1963) each had a SNAP-3 RTG.Transit 5B-2 (1963) had a SNAP-9A RTG.