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Rachmaninoff (crater)
Rachmaninoff is a peak-ring impact crater on Mercury. This basin, first imaged in its entirety during MESSENGER's third Mercury flyby, was quickly identified as a feature of high scientific interest, because of its fresh appearance, its distinctively colored interior plains, and the extensional troughs on its floor.〔(【引用サイトリンク】title=Rachmaninoff in Concert with Recently Named Craters on Mercury )〕 The morphology of Rachmaninoff is similar to that of Raditladi, which is one of the youngest impact basins on Mercury. The age of Raditladi is estimated at one billion years. Rachmaninoff appears to be only slightly older.
The central part of Rachmaninoff is occupied by a peak ring 130 km in diameter and somewhat elongated in the north-south direction. The area within it is covered by bright reddish smooth plains, which are different in color from the plains outside the peak ring. These plains are likely to be of volcanic origin because they show signs of flow. They also over-topped and covered the southern portion of the peak ring itself.〔
The smooth plains inside the peak ring were deformed by a set of concentric graben (troughs) much like those inside Raditladi. The troughs are located at half the distance to the peak ring from the center of the crater. Rachmaninoff is the fourth impact crater on Mercury (after Caloris, Rembrandt and Raditladi), where extensional tectonic features have been observed. The formation mechanism of the graben remains unknown.〔
The crater is named after Sergei Rachmaninoff, a Russian composer, pianist, and conductor (1873–1943).〔
==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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