Plesetsk Cosmodrome

Plesetsk Cosmodrome
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Name	Plesetsk Cosmodrome
Caption	Aerial view of launch facilities at Plesetsk.
Location	Near Mirny, Arkhangelsk Oblast, Russia
Operator	Russian Aerospace Forces
Founded	1957 (as an ICBM base)
First launch	17 March 1966 (Kosmos 112)
Launch pads	4 active

Plesetsk Cosmodrome is a major Russian spaceport and strategic missile base located in the Arkhangelsk Oblast of northwestern Russia. Established during the height of the Cold War, it has been one of the world's busiest launch sites, primarily serving military, reconnaissance, and scientific satellite missions. Its remote location provides advantageous orbital trajectories for accessing high-inclination and polar orbits, which are crucial for Earth observation and signals intelligence spacecraft. The facility remains a cornerstone of Russia's national security and space launch infrastructure.

History

The site's origins trace back to 1957 when the Soviet Union began constructing R-7 intercontinental ballistic missile (ICBM) facilities there, known as Object Angara. It was transformed into a secret cosmodrome, codenamed Kosmos, with its first satellite launch, Kosmos 112, occurring in 1966. The existence of the launch site was a closely guarded state secret until it was independently identified by British GCHQ analyst Geoffrey Perry and his Kettering Group in 1966 through orbital analysis. Throughout the Cold War, it served as the primary launch site for the Soviet space program's military and reconnaissance satellites, complementing the more civilian-focused Baikonur Cosmodrome. Following the dissolution of the Soviet Union, control transferred to the Russian Federation and its Space Forces.

Facilities and infrastructure

The cosmodrome sprawls across a vast, forested area and comprises numerous technical complexes, launch pads, and support installations. Key launch facilities have historically supported a wide array of Soviet and Russian rocket families, including the Kosmos-3M, Tsyklon, Rokot, and Soyuz-2. Major launch complexes include sites for the Molniya-M, Soyuz, and Angara rockets. The infrastructure includes vehicle assembly buildings, propellant storage facilities, tracking stations, and a dedicated military garrison town, Mirny. A specialized railway network connects the various technical areas, transporting rocket stages and payloads. Modernization efforts continue, with the Angara rocket complex being developed to support future heavy-lift capabilities.

Launch activities

It has conducted thousands of launches, making it one of the most active spaceports in history. Its primary mission profile has been the deployment of military satellites, such as Zenit photoreconnaissance, Tselina electronic intelligence, and Oko early warning spacecraft. It also launches numerous Kosmos series satellites for scientific and technological research, as well as GLONASS navigation satellites and Molniya communications satellites into highly elliptical orbits. While launch tempo has decreased since the Soviet era, it remains crucial for maintaining Russia's orbital constellations. Notable missions include the failed Kosmos 2251 launch, which later collided with Iridium 33 in 2009, creating significant space debris.

Military significance

As a facility operated by the Russian Aerospace Forces, its strategic military role is paramount. It is the primary launch site for Russia's military space assets, providing independent, secure access to space without reliance on the Baikonur Cosmodrome in Kazakhstan. This ensures continuity for critical national security functions like reconnaissance, communications, and missile early warning. The cosmodrome also hosts units of the Russian Strategic Rocket Forces, underscoring its dual role as a spaceport and a key element of Russia's nuclear deterrent posture. Its location offers a significant operational advantage for rapidly replacing satellites during a conflict, a concept central to Russian military doctrine.

Environmental and safety concerns

Operations have raised longstanding concerns due to the use of toxic propellants like unsymmetrical dimethylhydrazine (UDMH) and dinitrogen tetroxide. Accidental spills and the impact zones of spent rocket stages in the surrounding Arctic regions of the Komi Republic and Siberia have prompted studies into environmental contamination. A major disaster occurred in 1980 with the explosion of a Vostok-2M rocket on the launch pad, resulting in numerous casualties, though details were suppressed for years. The Russian government and Roscosmos have implemented improved safety protocols, and the newer Angara rocket uses more environmentally friendly RP-1 and liquid oxygen propellants.

Category:Spaceports Category:Buildings and structures in Arkhangelsk Oblast Category:Russian Aerospace Forces