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.

Jansen
Apollo 17 Mapping Camera image
Coordinates13°30′N 28°42′E / 13.5°N 28.7°E / 13.5; 28.7
Diameter24 km
Depth0.6 km
Colongitude351° at sunrise
EponymZacharias Janssen
The crater area (at the right) in selenochromatic format (Si). More infos here : https://www.gawh.it/main/selenocromatica
Oblique view from Apollo 15

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

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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.

References

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  1. ^ "Jansen (crater)". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
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