U.S. Centennial of Flight Commission home page
After Explorer launch

Three members of the Explorer team celebrate the announcement that Explorer I has become the first U.S. satellite to orbit the Earth, January 31, 1958. Left to right: William Pickering of the Jet Propulsion Lab, James van Allen of the State University of Iowa, and Wernher von Braun of the Army Ballistic Missile Agency.

Credits - NASA