KH-9 Hexagon

KH-9 Hexagon

series of U.S. reconnaissance satellites
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KH-9 (BYEMAN codename HEXAGON), commonly known as Big Bird or KeyHole-9, was a series of photographic reconnaissance satellites launched by the United States between 1971 and 1986. Of twenty launch attempts by the National Reconnaissance Office (NRO), all but one were successful. Photographic film aboard the KH-9 was stored on RCA Astro Electronic Division take up reel system then sent back to Earth in recoverable film return capsules for processing and interpretation. The highest ground resolution achieved by the main cameras of the satellite was 2 ft (0.61 m), though another source says "images in the "better-than-one-foot" category" for the last "Gambit" missions.

Mission type
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Operator
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COSPAR ID
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SPACECRAFT PROPERTIES

Manufacturer
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Launch mass
11400 kg to 13300 kg (with mapping camera)
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Dimensions
16.2 m × 3.05 m (53.1 ft × 10.0 ft)
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EXPEDITION

CREW

START OF MISSION

Rocket
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Launch site
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Contractor
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END OF MISSION

ORBITAL PARAMETERS

Reference system
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Regime
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Inclination
97°
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PAYLOAD

MAIN TELESCOPE

Type
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Diameter
0.91 m (3 ft 0 in)
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Focal length
1.52 m (5 ft 0 in)
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Focal ratio
f/3.0
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Wavelengths
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TRANSPONDERS

Contributors

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