Kosmos 1805

Kosmos 1805 (Russian: Космос 1805 meaning Cosmos 1805) was a Soviet electronic intelligence satellite which was launched in 1986. The first of four Tselina-R satellites to fly, it was constructed by Yuzhnoye with its ELINT payload manufactured by TsNII-108 GKRE. Since it ceased operations it has remained in orbit as space junk, and in April 2012 NASA's Fermi Gamma-ray Space Telescope was forced to maneuver to avoid a collision with the derelict satellite.