Author Topic: Pioneer 4  (Read 565 times)

Offline catdlr

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Pioneer 4
« on: 03/04/2018 03:50 AM »
Pioneer 4 Launched to the moon: Wernher von Braun in the blockhaus. (March 3, 1959)

Dan Beaumont Space Museum
Published on Mar 3, 2018

Pioneer 4 was a spin-stabilized spacecraft launched on a lunar flyby trajectory and into a heliocentric orbit making it the first US probe to escape from the Earth's gravity. It carried a payload similar to Pioneer 3: a lunar radiation environment experiment using a Geiger-Mueller tube detector and a lunar photography experiment. It passed within 60,000 km of the Moon's surface. However, Pioneer 4 did not come close enough to trigger the photoelectric sensor. No lunar radiation was detected. The spacecraft was still in solar orbit as of 1969.

Tony De La Rosa