Kosmos 1805 (Russian: Космос 1805 meaning Cosmos 1805) was a Soviet electronic intelligence satellite which was launched in 1986.
[1] The first of four Tselina-R satellites to fly, it was constructed by Yuzhnoye with its ELINT payload manufactured by TsNII-108 GKRE.
[1] Kosmos 1805 was launched at 07:30 UTC on December 10, 1986 atop a Tsyklon-3 rocket flying from Site 32/2 at the Plesetsk Cosmodrome.
Orbital predictions several days earlier indicated that the two satellites were expected to occupy the same point in space within 30 milliseconds of each other.
On April 3, 2012 telescope operators decided to stow the satellite's high-gain parabolic antenna, rotate the solar panels out of the way and fire Fermi's rocket thrusters for one second to move it out of the way.