The DS-P1-Yu series of satellites was used to calibrate space surveillance and early warning radars. July 30, 1964 at 03:36 UTC · Launch Successful Kosmos-2I — Soviet Space Program, to Low Earth Orbit Mayak-2, Kapustin Yar, Russian Federation The world's 344th orbital launch attempt, and 51st of 1964. Data: Launch Library 2, The Space Devs. Image via The Space Devs.