Kosmos 2105

Kosmos 2105 (Russian: Космос 2105 meaning Cosmos 2105) is a Russian US-K missile early warning satellite which was launched in 1990 as part of the Russian Space Forces' Oko programme. The satellite is designed to identify missile launches using optical telescopes and infrared sensors.^[2]

Kosmos 2105

Mission type	Early warning
COSPAR ID	1990-099A
SATCAT no.	20941
Mission duration	4 years [1]
Spacecraft properties
Spacecraft type	US-K[2]
Launch mass	1,900 kilograms (4,200 lb)[3]
Start of mission
Launch date	20 November 1990, 02:33 (1990-11-20UTC02:33Z) UTC
Rocket	Molniya-M/2BL[2]
Launch site	Plesetsk Cosmodrome[2][3]
End of mission
Decay date	21 January 2008 (2008-01-22)[4]
Orbital parameters
Reference system	Geocentric
Regime	Molniya [2]
Perigee altitude	594 kilometres (369 mi)[4]
Apogee altitude	39,751 kilometres (24,700 mi)[4]
Inclination	63.2 degrees[4]
Period	717.60 minutes[4]

Kosmos 2105 was launched from Site 16/2 at Plesetsk Cosmodrome in Russia.^[5] A Molniya-M carrier rocket with a 2BL upper stage was used to perform the launch, which took place at 02:33 UTC on 20 November 1990.^[3] The launch successfully placed the satellite into a molniya orbit. It subsequently received its Kosmos designation, and the international designator 1990-099A.^[3] The United States Space Command assigned it the Satellite Catalog Number 20941.^[3]

It re-entered the Earth's atmosphere on 21 January 2008.^[4]

See also

• Spaceflight portal

• List of Kosmos satellites (2001–2250)
• List of R-7 launches (1990–1994)
• 1990 in spaceflight
• List of Oko satellites