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Opelt (crater)
Opelt is the lava-flooded remnant of a lunar crater on the Mare Nubium. It lies to the north of a similar formation named Gould, and to the northeast of the prominent Bullialdus.
Only a slightly raised outline remains of Opelt's rim, the interior having been inundated with lava. The rim has a wide break at the northern end and several smaller breaks to the south and southeast. The satellite craterlet Opelt E lies at the southern end of the surviving western rim. The interior floor is nearly level, with the exception of a slight rise to the southwest.
To the north of Opelt on the lunar mare is a sinuous system of rilles designated Rimae Opelt. These occupy a diameter of about 70 kilometers.
==Satellite craters==
By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Opelt.
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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