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USA-193
USA-193, also known as NRO launch 21 (NROL-21 or simply L-21), was a U.S. military reconnaissance satellite (radar imaging) launched on December 14, 2006.〔(【引用サイトリンク】url=http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=2006-057A )〕 It was the first launch conducted by the United Launch Alliance.〔(【引用サイトリンク】 url=http://www.metrodenver.org/news-center/metro-denver-news/ULA.html )〕 Owned by the National Reconnaissance Office (NRO), the craft's precise function and purpose were classified.
The satellite malfunctioned shortly after deployment, and was intentionally destroyed 14 months later on February 21, 2008, by a modified SM-3 missile fired from the warship USS ''Lake Erie'', stationed west of Hawaii. The event highlighted growing distrust between the U.S. and China, and was viewed by some to be part of a wider "space race" involving the U.S., China, and Russia.
==Design==
USA-193 was part of the NRO's Future Imagery Architecture, which was begun in 1997 to produce a fleet of inexpensive reconnaissance satellites, but has become the agency's most spectacular failure. USA-193 was initially developed by Boeing, which won the contract in 1999, beating out Lockheed Martin with proposals for innovative electro-optics and radar. But after cost overruns, delays, and parts failures, NRO sent the contract to Lockheed, which built USA-193 around the Boeing radar design.〔 Lockheed Martin and Boeing both supported the launch, the first in the joint effort known as the United Launch Alliance.〔(【引用サイトリンク】publisher=GlobalSecurity.org )〕
USA-193 weighed about ,〔 with a body thought to be long and wide, estimates based on the maximum Delta II payload. With the radar antenna extended, USA-193 was about the size of a basketball court (~30 x 15m).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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