Kosmos_393
Kosmos 393 (Russian: Космос 393 meaning Cosmos 393), known before launch as DS-P1-Yu No.34, 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.[1]