KH-9 (nombre en código de BYEMAN HEXÁGONO), comúnmente conocido como Big Bird 1 o KeyHole-9, fue una serie de satélites de reconocimiento fotográfico lanzado por los Estados Unidos entre 1971 y 1986. SpaceRef.com: KH-9 Hexagon Spy Satellite Makes a Rare Public Outing (Photos and Video), https://en.wikipedia.org/w/index.php?title=KH-9_Hexagon&oldid=992885600, Reconnaissance satellites of the United States, Articles with dead external links from November 2017, Articles with permanently dead external links, Short description is different from Wikidata, Articles with unsourced statements from July 2007, Creative Commons Attribution-ShareAlike License, Total weight: 11,400 kg (25,100 lb), with mapping camera 13,300 kg (29,300 lb), Max. The main mirror directs the light through an opening in the flat mirror and through a four-element lens system onto the film platen. [citation needed][20], Missions 1205 to 1207 carried Doppler beacons[21] to help map the atmospheric density at high altitudes in an effort to understand the effect on ephemeris predictions. Integration and ground-testing of Satellite Vehicle-1 (SV-1) were completed in May 1971, and it was subsequently shipped to Vandenberg Air Force Base in a 70-foot (21 m) container. The flight of the Big Bird (part 2) The origins, development, and operations of the KH-9 HEXAGON reconnaissance satellite by Dwayne A. [2] Photographic film aboard the KH-9 was sent back to Earth in recoverable film return capsules for processing and interpretation. A technician despools one of the re-entry modules which contained the film used by the cameras. Basic specifications and diagram of the KH-9. Cartierville Airport in 1971 by KH-9 Satellite.png 2,262 × 1,496; 2.81 MB The satellites were instrumental in U.S. National Technical Means of Verification of SALT and the Anti-Ballistic Missile Treaty. HEXAGON KH-9 Reconnaissance Satellite Note: The appearance of hyperlinks does not constitute endorsement by the National Museum of the USAF, the U.S. Air Force, or the Department of Defense, of the external website, or the information, products or services contained therein. Il n'y eut qu'un seul échec sur les 20 lancements effectués. SCS was intended as a more capable replacement for the on-orbit propulsion, which had been provided by the Agena upper stage for previous generations of reconnaissance satellites. Images were taken at altitudes ranging from 90–200 miles (480,000–1,060,000 ft; 140–320 km). [24], Missions 1203, 1207, 1208, 1209, and 1212 to 1219 included Ferret ELINT subsatellites, which were launched into a high earth orbit to catalogue Soviet air defence radars, eavesdrop on voice communications, and tape missile and satellite telemetry. Other than a few minor glitches, such as a film capsule that sank in the North Pacific, the mission was successful (see “The flight of the Big Bird (part 3)” , The Space Review, February 21, 2011). Four re-entry vehicles were carried on most missions, with a fifth added for missions that included a mapping camera. Re: KH-9 HEXAGON Reconnaissance Satellite « Reply #636 on: 11/25/2020 08:27 pm » Note that the "GARWIN" mentioned in the document is most likely Richard Garwin, a scientific advisor. The cameras could scan contiguous areas up to 120 degrees wide, and achieved a ground resolution better than 2 ft (0.61 m) during the later phase of the project. Between September 1966 and July 1967, the contractors for the Hexagon subsystems were selected. A KH-9 re-entry module hanging from its parachute, ready to be retrieved. The Hexagon KH-9 images have a spatial resolution of 6–9m and a wide geographic coverage (125km 250km), with consecutive ground nadir images possessing ˘70% overlap (Surazakov and Aizen, 2010; Pieczonka et al., 2013). Two added tanks with ullage control for the Orbit Adjust System (OAS) and new thrusters for the Reaction Control System (RCS) served to increase KH-9's operational lifetime. Ultimately, four generations ("blocks") of KH-9 Hexagon reconnaissance satellites were developed. LMSC was awarded the contract for the Satellite Basic Assembly (SBA), Perkin Elmer for the primary Sensor Subsystem (SS), McDonnell for the Reentry Vehicle (RV), RCA Astro-Electronics Division for the Film Take-Up system, and Itek for the Stellar Index camera (SI). [18], Scientific analysis of declassified KH-9 satellite images continues to reveal historic trends and changes in climate and terrestrial geology. 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