Elektron was one of the earliest Soviet scientific satellite missions to be authorized following the initial Sputnik (D-1) series. July 10, 1964 at 21:51 UTC · Launch Successful Vostok-K — Soviet Space Program, to Elliptical Orbit 1/5, Baikonur Cosmodrome, Republic of Kazakhstan The world's 339th orbital launch attempt, and 46th of 1964. Data: Launch Library 2, The Space Devs. Image via The Space Devs.