The Pioneer 6 space probe was launched atop a Delta-E rocket.
Pioneer 6 was the first in a series of four probes (also known as A, B, C, and D) which made up the second part of the Pioneer space program. Pioneer probes 6 through 9 were designed to take measurements of interplanetary phenomena from distant points in space. The probes were only supposed to last approximately six months, but contact with Pioneer 6 was made as late as December 8, 2000.