Relay 1 was principally a communications satellite. Included in its payload were radiation experiments designed to map the earth's radiation belts. December 13, 1962 at 23:30 UTC · Launch Successful Thor Delta B — United States Air Force, to Elliptical Orbit Space Launch Complex 17A, Cape Canaveral SFS, FL, USA The world's 219th orbital launch attempt, and 77th of 1962. Data: Launch Library 2, The Space Devs.