The DS-P1 series of satellites was used to calibrate space surveillance and early warning radars. April 6, 1963 at 03:01 UTC · Launch Failure Kosmos-2I — Soviet Space Program, to Low Earth Orbit Mayak-2, Kapustin Yar, Russian Federation The world's 238th orbital launch attempt, and 14th of 1963. Data: Launch Library 2, The Space Devs. Image via The Space Devs.