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(163249) 2002 GT
(163249) 2002 GT is an Apollo asteroid with an absolute magnitude of 18.26.〔 It is a potentially hazardous asteroid as its orbit crosses that of Earth.〔Stephen Clark, ("Deep Impact sets path for asteroid encounter in 2020" ). ''Spaceflight Now''. 18 December, 2011.〕
In 2011, NASA considered sending the unmanned spacecraft ''Deep Impact'' toward the asteroid with the aim of performing a flyby〔 in 2020. It was uncertain whether ''Deep Impact'' carried sufficient fuel for this operation.〔
On November 24, 2011 and October 4, 2012, the space probe's thrusters were fired briefly for two trajectory correction maneuvers that targeted Deep Impact for an encounter with 2002 GT in 2020, possibly within a distance of no more than 400 kilometers. However, funding for the flyby mission was not guaranteed.〔 Emily Lakdawalla blog entry: ("Deep Impact targets possible 2020 asteroid flyby" ). 5 October, 2012.〕 In June 2013 the asteroid was observed in radar by the Arecibo Observatory.〔(Asteroid and Comet Mission Targets Observed by Radar )〕
However, on August 8, 2013 NASA lost communication with the spacecraft, and on September 20, 2013, NASA abandoned further attempts to contact the craft.〔(NASA calls off search for lost Deep Impact comet probe ) - Australian Broadcasting Corporation - Retrieved September 21, 2013.〕 According to A'Hearn,〔(【引用サイトリンク】title=NASA Declares End to Deep Impact Comet Mission Communication cutoff leads to loss of comet hunter, say space officials. )〕 the most probable reason of software malfunction was a Y2K-like problem (at 11 August 2013 0:38:49 it was 232 deciseconds from 1 January 2000〔[http://permalink.gmane.org/gmane.comp.time.tz/7588 [tz] Deep Impact: wrong time zone?]〕).
== References ==
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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