Longomontanus (crater)


Longomontanus is an ancient lunar impact crater located in the rugged southern highlands to the southwest of the bright ray crater Tycho. Longomontanus is of the variety of large lunar formations called a "walled plain", although it is actually more of a circular depression in the surface.
Because of its location, Longomontanus appears distinctly oval in shape due to foreshortening. To the southeast of Longomontanus is the even larger formation Clavius, and to the east is Maginus. North of the rim is the irregular crater Montanari, which in turn is joined at its northern rim by Wilhelm.
The wall of Longomontanus is heavily worn and incised by past impacts, and the rim is essentially level with the surrounding terrain. The northern rim especially is impacted with multiple overlapping craterlets. To the east of the rim is a semi-circular ridge that has the appearance of an overlapped crater rim. The crater floor of Longomontanus is relatively flat, with a low cluster of central peaks somewhat offset to the west.

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 Longomontanus.
LongomontanusLatitudeLongitudeDiameter
A52.8° S24.0° W29 km
B52.9° S20.7° W48 km
C53.4° S19.0° W31 km
D54.3° S22.9° W29 km
E51.4° S18.0° W8 km
F48.2° S23.5° W19 km
G48.7° S18.5° W15 km
H52.0° S23.2° W7 km
K47.9° S20.9° W15 km
L49.1° S23.6° W16 km
M48.6° S23.2° W10 km
N50.8° S25.7° W12 km
P48.1° S25.3° W7 km
Q52.0° S20.5° W11 km
R52.4° S26.1° W9 km
S47.4° S23.3° W12 km
T46.8° S22.7° W5 km
U52.0° S22.0° W7 km
V50.7° S18.9° W5 km
W47.1° S21.3° W10 km
X53.0° S17.7° W5 km
Y52.3° S28.2° W4 km
Z50.0° S18.7° W95 km