Jansen (crater)

Jansen

Apollo 17 Mapping Camera image
Coordinates	13°30′N 28°42′E / 13.5°N 28.7°E / 13.5; 28.7
Diameter	24 km
Depth	0.6 km
Colongitude	351° at sunrise
Eponym	Zacharias Janssen

Jansen is a lunar impact crater in the north part of the Mare Tranquillitatis. The diameter is 24 km. It was named after 17th century Dutch optician Zacharias Janssen.^[1] 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.