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Allan Hills A81005
Allan Hills A81005 or ALH A81005 (sometimes also named without the "A" in front of the number) was the first lunar meteorite found on Earth. It was found in 1982 in the Allan Hills at the end of the Transantarctic Mountains, during a meteorite gathering expedition (ANSMET).〔(【引用サイトリンク】url=http://www.lpi.usra.edu/meteor/metbull.php?code=1965 )〕
==Discovery and naming==
ALH A81005 was found on 17 January 1982 by John Schutt and Ian Whillans. It is named after the Allan Hills, a mountain chain in Antarctica where many meteorites are gathered by expeditions.〔 The large number of meteorites collected in Antarctica and the lack of geographic terms that could be used for names have led to the adaption of the "Antarctic rules" for meteorite naming. Every meteorite found in Antarctica receives the names of the collection area (Allan Hills) and a number. The number consists of the year the expedition started "81" and a three digit number that is given out consecutively (005). The "A" in front of the number stands for meteorites collected by ANSMET expeditions and can be considered optional.〔(【引用サイトリンク】url=http://meteoriticalsociety.org/?page_id=60 )〕 The definition of the year is used because the year changes during the Austral summer season (December to March) and this avoids samples from one expedition having different years. This is the reason ALH A81005 has the year "81" in its name despite being found on 17 January 1982.〔
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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