Vostok programme
Korabl-Sputnik 1 ( meaning "Vessel Satellite 1"), also known as Sputnik 4 in the West, was the first test flight of the Soviet Vostok programme, and the first Vostok spacecraft. It was launched on May 15, 1960. Though Korabl-Sputnik 1 was unmanned, it was a precursor to the first human spaceflight, Vostok 1. Its mass was , of which was instrumentation.