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Koga (crater)
Koga is a Martian impact crater, approximately 19 kilometers in diameter. It is located at 29.3°S, 103.8°W, north of the crater Virrat and northeast of the crater Dinorwic. To the north is the crater Nhill. It is named after a town in Tanzania, and its name was approved by the International Astronomical Union in 1991.〔(【引用サイトリンク】 work=USGS Gazetteer of Planetary Nomenclature Feature Information )〕〔''NASA World Wind'' 1.4. NASA Ames Research Center, 2007.〕 According to a surface age map of Mars based on US Geological Survey data, the area around Koga is from the Noachian epoch, which places the area's age at 3.8 to 3.5 billion years ago.〔(【引用サイトリンク】 work=lpi.usra.edu )〕 Sharp blocks and cliffs poke through a mantle of fine material located at the bottom of the crater.〔(【引用サイトリンク】 work=themis.asu.edu )〕 At the deepest part of the crater, it is about 5,200 meters in elevation above zero altitude, and its rim averages about 6,400 meters above zero altitude. It is therefore approximately 1.2 kilometers deep.〔
==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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