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Wallach is a tiny lunar impact crater located in the eastern Mare Tranquillitatis. It is a circular, bowl-shaped feature with a negligible interior floor; the inner walls just slope down to the midpoint of the crater. Wallach is located to the northeast of the crater Maskelyne, near some low ridges in the lunar mare. It was previously identified as Maskelyne H before being given a name by the IAU. An unusual and apparently unnamed elongate crater about 2 km x 5 km in size and about 44 km east of Wallach was the subject of a landmark tracking exercise on Apollo 8 in December 1968.〔Apollo 8 Flight Journal, Photography Index, (70-mm Magazine E ), photos AS08-13-2271 to AS08-13-2309〕 The feature was photographed repeatedly from its emergence on the horizon to after the Command Module had passed directly over it. ==References== * * * * * * * * * * * * 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「Wallach (crater)」の詳細全文を読む スポンサード リンク
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