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ou?/where?: au sol - ground
autographe?: non - none
Beskrivning : These satellites were used to calibrate the Dnestr (NATO-codename: `Hen House`) space surveillance and early warning radars. These satellites were built on a dodecahedral structure, which carried solar cells. The satelite was covered by a spherical mesh reflector transparent for light-region waves and non-transparent for decimetric and metric radio waves. 4 of these satellites were launched between 1962 and 1964 on Kosmos boosters. One failed to reach orbit. They were replaced by the similar operational DS-P1-Yu series.