Yantar-4K1
Yantar-4K1 was a modification of the Yantar-2K. It had a better camera, the Zhemchug-18, and was in orbit for 45 days rather than the 30 days of Yantar-2K. Other systems were the same as the Yantar-2K and both types of satellites were launched in the same period. Both satellites were retired in 1984.
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