The DS-P1-Yu series of satellites was used to calibrate space surveillance and early warning radars. December 21, 1965 at 06:14 UTC · Launch Successful Kosmos-2I — Soviet Space Program, to Low Earth Orbit 86/1, Kapustin Yar, Russian Federation The world's 511th orbital launch attempt, and 118th of 1965. Data: Launch Library 2, The Space Devs. Image via The Space Devs.