description KH-9 Hexagon Overview
The KH-9 Hexagon was a series of large photoreconnaissance satellites operated by the US National Reconnaissance Office (NRO) from 1971 to 1986. Often referred to as "Big Bird," it combined high-resolution mapping and surveillance photography into a single platform. The satellite utilized a film-return system, ejecting multiple reentry capsules containing exposed film that were caught in mid-air by recovery aircraft. It played a vital role in verifying strategic arms agreements during the Cold War.
insights Ranking position
KH-9 Hexagon ranks #9 of 187 in the Satellite ranking, behind GOES-R (GOES-16), ahead of Sentinel-2B.
help KH-9 Hexagon FAQ
What was the primary mission of the KH-9 Hexagon satellite?
The KH-9 Hexagon was a highly classified film-return reconnaissance satellite used by the US National Reconnaissance Office (NRO). Its primary mission during the Cold War was to map the Soviet Union and other territories at roughly 0.6-meter resolution.
How did the KH-9 Hexagon return its photographs to Earth?
Since it predated digital imaging, the Hexagon carried multiple recovery capsules loaded with exposed film. These capsules were ejected from the satellite in orbit, parachuted back to Earth, and were famously snatched mid-air by specially equipped military aircraft.
During what years did the KH-9 Hexagon operate?
The KH-9 Hexagon series was operational from 1971 until 1986. It served as a vital strategic intelligence asset bridging the gap before the era of real-time digital imagery.
What was the physical scale of the KH-9 Hexagon?
The Hexagon was the largest spy satellite of its era, reportedly measuring about 60 feet long and 10 feet in diameter. It was so massive it was often compared in size to a school bus or a freight train car.
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