Sputnik 20

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Sputnik 20 (also known as 1962 Alpha Tau 1) was a Soviet spacecraft originally intended to be a Venus landing mission. The Venera-type spacecraft was successfully inserted into geocentric orbit by the SL-6/A-2-e launcher. The escape stage failed and the spacecraft was stranded in Earth orbit until it re-entered the Earth's atmosphere 5 days later.

v • d • e Venera programme

1VA • Venera 1 • Sputnik 19 • Sputnik 20 • Sputnik 21 • Cosmos 21 • Venera 1964A • Venera 1964B • Cosmos 27 • Venera 2 • Venera 3 • Cosmos 96 • Venera 1965A • Venera 4 • Cosmos 167 • Venera 5 • Venera 6 • Venera 7 • Cosmos 359 • Venera 8 • Cosmos 482 • Venera 9 • Venera 10 • Venera 11 • Venera 12 • Venera 13 • Venera 14 • Venera 15 • Venera 16 • Venera-D