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USA-212〔 was the first flight of the Boeing X-37B Orbital Test Vehicle 1 (X-37B OTV-1), an American unmanned robotic vertical-takeoff, horizontal-landing (VTHL) spaceplane. It was launched aboard an Atlas V rocket from Cape Canaveral on 22 April 2010, and operated in low Earth orbit. Its designation is part of the USA series. The spaceplane is operated by the United States Air Force, which has not revealed the specific identity of the spaceship's payload for the mission. The Air Force has stated only that the spacecraft would "demonstrate various experiments and allow satellite sensors, subsystems, components, and associated technology to be transported into space and back." ==Launch== USA-212 was launched on an Atlas V 501 rocket, tail number AV-012, from Space Launch Complex 41 at the Cape Canaveral Air Force Station in Florida. The launch, which was conducted by United Launch Alliance, occurred at 23:52 UTC on 22 April 2010, placing the spacecraft into low Earth orbit for testing. The X-37B spacecraft was originally intended to be deployed from the payload bay of a NASA Space Shuttle, but following the ''Columbia'' accident, it was transferred to a Delta II 7920. It was subsequently transferred to the Atlas V following concerns over the X-37B's aerodynamic properties during launch.〔 The launch was the first flight of the Atlas V 501 configuration, and the first in four years to use a payload fairing.〔 Prior to the installation of the spacecraft, the Atlas rocket was moved to the launch pad and performed a wet dress rehearsal on 2 April 2010. It was returned to the Vertical Integration Facility the next day for final assembly.〔 The X-37 arrived at the VIF on 8 April. On 9 April, a 24-hour delay was announced. It subsequently slipped a further 24 hours after the landing of on Mission STS-131 was delayed, as the Eastern Range could not have been reconfigured quickly enough to accommodate both events on the same day. After a series of delays, it was set for 19 April 2010. On 21 April, the Atlas was rolled back out to the launch pad for launch.〔 The launch window on 22 April opened at 23:52 UTC, and closed at 00:01 on 23 April. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「USA-212」の詳細全文を読む スポンサード リンク
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