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Jansen is lunar crater in the north part of the Mare Tranquillitatis. It is located to the east-southeast of the crater Plinius. The rim of Jansen is low and narrow, with a notch along the western edge. The interior is relatively level, which may indicate it has been covered by lava. To the south-southwest a small but prominent crater lies on the crater floor, halfway between the center and the rim. To the northwest of the rim is a rille named Rima Jansen, and to the east are wrinkle ridges in the mare surface. A low ridge runs from near the southeast rim in a southeasterly direction. ==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 Jansen. The following craters have been renamed by the IAU. * Jansen B — ''See'' Carrel. * Jansen C — ''See'' Beketov. * Jansen F — ''See'' Cajal. File:Jansen L crater AS15-P-9862.jpg|Jansen L File:Jansen R ghost crater AS17-M-1656.jpg|Oblique view of the ghost crater Jansen R ("pancake" at center) and Jansen D crater (lower right) 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「Jansen (crater)」の詳細全文を読む スポンサード リンク
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