Cosmos 1402
Encyclopedia
Kosmos 1402 was a Soviet spy satellite
Spy satellite
A spy satellite is an Earth observation satellite or communications satellite deployed for military or intelligence applications....

 that failed to achieve its correct orbit. Normally, such satellites burn up harmlessly in the Earth's atmosphere upon re-entry. However, Kosmos 1402 was nuclear power
Nuclear power
Nuclear power is the use of sustained nuclear fission to generate heat and electricity. Nuclear power plants provide about 6% of the world's energy and 13–14% of the world's electricity, with the U.S., France, and Japan together accounting for about 50% of nuclear generated electricity...

ed. A similar satellite, Kosmos 954, crashed in Canada's Northwest Territories
Northwest Territories
The Northwest Territories is a federal territory of Canada.Located in northern Canada, the territory borders Canada's two other territories, Yukon to the west and Nunavut to the east, and three provinces: British Columbia to the southwest, and Alberta and Saskatchewan to the south...

in 1978.

Kosmos 1402 was launched on August 30, 1982. Normally, such satellites separate from their reactor core upon completion of the mission. The core is then boosted into a "parking orbit". However, the core of 1402 did not separate. Kosmos 1402 reentered the Earth's atmosphere on January 23, 1983, hundreds of miles south of the island of Diego Garcia in the Indian Ocean, leaving no known debris. The core re-entered on February 7, 1983.

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