Janssen (lunar crater)

lunar crater data
latitude=44.9
N_or_S=S
longitude=41.5
E_or_W=E
diameter=190 km
depth=2.9 km
colong=320
eponym=Pierre J. C. Janssen

Janssen is an ancient impact crater located in the highland region near the southeastern lunar . The entire structure has been heavily worn and is marked by many lesser crater impacts. The outer wall is breached in multiple locations, but the outline of the crater rim can still be observed. The wall forms a distinctive hexagonal shape upon the rugged lunar surface, with a slight curvature at the vertices.

The prominent crater Fabricius lies entirely within the outer wall, in the northeast quadrant of the floor. A number of other lesser, but still notable craters mark the crater floor. Connected to the northeast rim is Metius, and to the north is the heavily worn Brenner. Southeast of Janssen are the co-joined craters Steinheil and Watt. Astride the southwest wall is the smaller Lockyer. Further to the east, although appearing nearby due to elongation, is the huge "Vallis Rheita".

In the south two-thirds of Janssen can be discerned the remains of a large, concentric crater, the wall of which is overlaid by Fabricus. The floor of this inner depression contains a rille system named the "Rimae Janssen". The rille curves from the rim of Fabricius crater to the southeast of the outer wall of Janssen, extending for a distance of up to 140 kilometers.

atellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Janssen.

References

* cite web
last = Wood | first = Chuck | date = October 1, 2007
url = http://www.lpod.org/?m=20071001
title = Crateric Concatenation
publisher = Lunar Photo of the Day
accessdate = 2007-10-01