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Kerberos (moon)
Kerberos is a small natural satellite of Pluto, about in its longest dimension. It was the fourth moon of Pluto to be discovered and its existence was announced on 20 July 2011. It was imaged, along with Pluto and its four other moons, by the ''New Horizons'' spacecraft in July 2015.〔(【引用サイトリンク】author=Cain, Fraser )〕 The first image was released to the public on 22 October 2015.〔
== Discovery ==
Kerberos was discovered by the Pluto Companion Search Team using the Hubble Space Telescope on 28 June 2011, using the Wide Field Camera 3, during an attempt to find any rings that Pluto might possess. Further observations were made on 3 and 18 July 2011 and Kerberos was verified as a new moon on 20 July 2011.〔〔(【引用サイトリンク】title=Pluto Has Another Moon, Hubble Photos Reveal | Dwarf Planet Pluto | Pluto's Moons )〕 It was later 'precovered' (identified in earlier archival Hubble images) in images from 15 February 2006 and 25 June 2010.〔 Kerberos's brightness is only about 10% of that of Nix, and it was only found because the discovery team took 8-minute exposures; earlier observations had used shorter exposures.〔
The provisional designation of the satellite varied based on the source used. The International Astronomical Union announced it as S/2011 (134340) 1,〔 whereas the ''New Horizons'' mission website announced it as S/2011 P 1.〔''New Horizons'' news, Johns Hopkins University Applied Physics Laboratory, ("Fourth Moon Adds to Pluto's Appeal" ), 20 July 2011〕
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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