The Koltso satellites were an enlarged version of the Taifun-2 radar calibration satellites.
Kosltso was a third-generation system with a more accurate pointing system and a larger amount of up to 36 Romb subsatellites. It was designed to test elements of the Moscow air defence system.
Three satellites were launched on Tsiklon-3 boosters.
|Nation:||USSR / Russia|
|Type / Application:||Radar calibration|
|Power:||8 deployable fixed solar arrays, batteries|
|Kosmos 1985 (Koltso #1)||1988-113A||23.12.1988||Pl LC-32/1||Tsiklon-3||with 36(36) Romb|
|Kosmos 2053 (Koltso #2)||1989-100A||27.12.1989||Pl LC-32/2||Tsiklon-3||with 36(36) Romb|
|Kosmos 2106 (Koltso #3)||1990-104A||28.11.1990||Pl LC-32/2||Tsiklon-3||with 36(1) Romb|