Explorer1: 2of 3 Jan 31, 1958

http://www.jpl.nasa.gov/explorer/history/
Explorer 1 First U.S. Satellite - NASA JPL
"Explorer 1 was the first satellite launched by the United States when it was sent into space on January 31, 1958. Following the launch of the Soviet Union's Sputnik 1 on October 4, 1957, the U.S. Army Ballistic Missile Agency was directed to launch a satellite using its Jupiter C rocket developed under the direction of Dr. Wernher von Braun. "

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