SOLRAD (SOLar RADiation) 4B was a solar X-ray, ultraviolet, and electronic surveillance satellite. Developed by the United States Navy's United States Naval Research Laboratory, it was the fifth in both the SOLRAD and the GRAB (Galactic Radiation And Background) programs. April 26, 1962 at 10:49 UTC · Launch Failure Scout X-2 — US Navy, to Low Earth Orbit Space Launch Complex 5, Vandenberg SFB, CA, USA The world's 160th orbital launch attempt, and 18th of 1962. Data: Launch Library 2, The Space Devs.