Jansen (crater)

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Jansen crater AS17-M-2879.jpg
Apollo 17 Mapping Camera image
Coordinates 13°30′N 28°42′E / 13.5°N 28.7°E / 13.5; 28.7Coordinates: 13°30′N 28°42′E / 13.5°N 28.7°E / 13.5; 28.7
Diameter 23 km
Depth 0.6 km
Colongitude 351° at sunrise
Eponym Zacharias Janssen
Oblique view from Apollo 15

Jansen is a 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[edit]

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.

Jansen Latitude Longitude Diameter
D 15.7° N 28.4° E 7 km
E 14.5° N 27.8° E 7 km
G 9.3° N 26.0° E 6 km
H 11.4° N 28.4° E 7 km
K 11.5° N 29.7° E 6 km
L 14.7° N 30.1° E 7 km
R 15.2° N 28.8° E 25 km
T 11.4° N 33.5° E 5 km
U 11.9° N 32.3° E 4 km
W 10.2° N 29.5° E 3 km
Y 13.4° N 28.6° E 4 km

The following craters have been renamed by the IAU.


  • Wood, Chuck (January 15, 2007). "Stereo Jansen". Lunar Photo of the Day. Archived from the original on September 27, 2007. Retrieved 2007-01-15.