OSO (Orbital Solar Observatory) satellite. Its purpose was to return data on the ultraviolet, X-ray and gamma ray emissions of the sun and galaxy. February 3, 1965 at 16:36 UTC · Launch Successful Thor Delta C — United States Air Force, to Low Earth Orbit Space Launch Complex 17B, Cape Canaveral SFS, FL, USA The world's 401st orbital launch attempt, and 8th of 1965. Data: Launch Library 2, The Space Devs. Image by NASA (NASA Image and Media Guidelines) via The Space Devs.