Cosmos 613 is the codename for an unmanned flight of the Soviet Soyuz spacecraft that carried out in 1973/74 tests in Earth orbit in winter. It was common in the Soviet Union to give only successful missions an official name. Failed flights were mostly not announced and test flights only under the general cover name cosmos.
The launch took place on November 30th at 05:16 UTC clock from Soviet Baikonur Cosmodrome aboard a Soyuz rocket. In general, there followed a two -month long-term test of all systems. The landing took place on 29 January 1974 at 05:29 UTC.
Parallel to this flight, the U.S. Skylab 4 mission took place, in which the long-term record has been improved for a manned stay in space to just under three months.