Tags: Artificialsatellite, Satellite.
Kosmos 421 (Russian: Космос 421 meaning Cosmos 421) known before launch as DS-P1-Yu No.48 was a Soviet satellite which was launched in 1971 as part of the Dnepropetrovsk Sputnik programme. It was a 325-kilogram (717 lb) spacecraft which was built by the Yuzhnoye Design Bureau and was used as a radar calibration target for anti-ballistic missile tests.