Schickard (crater)
Encyclopedia
Schickard is a lunar impact crater
Impact crater
In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body...

 of the form called a walled plain. It lies in the southwest sector of the Moon, near the lunar limb. As a result the crater appears oblong
Rectangle
In Euclidean plane geometry, a rectangle is any quadrilateral with four right angles. The term "oblong" is occasionally used to refer to a non-square rectangle...

 due to foreshortening. Attached to the northern rim is the lesser crater Lehmann
Lehmann (crater)
Lehmann is a lunar impact crater attached to the northern rim of the much larger walled plain Schickard. To the northwest is the crater Lacroix....

, and to the northeast is the even smaller Drebbel
Drebbel (crater)
Drebbel is a small lunar crater that is located to the northeast of the large walled plain Schickard, in the southwestern part of the Moon. Further to the northeast is the Lacus Excellentiae and the small crater Clausius....

. Southeast of Schickard is Wargentin
Wargentin (crater)
Wargentin is an unusual lunar impact crater which has been filled to its rim by a basaltic lava flow, forming a raised plateau. When the lava flow occurred, it erupted from within the crater walls and proceeded to accumulate until overrunning the lowest portion of the rim. Some blockage then...

, a lava-flooded plateau.

Schickard has a worn rim that is overlain in several locations by smaller impact craters. The most prominent of these is the irregular Schickard E across the southeastern rim. The floor of Schickard has been partially flooded by lava, leaving only the southwest portion uncovered and rough-textured.

Schickard's floor is marked with a triangular band of lighter-albedo
Albedo
Albedo , or reflection coefficient, is the diffuse reflectivity or reflecting power of a surface. It is defined as the ratio of reflected radiation from the surface to incident radiation upon it...

material, leaving relatively darker patches in the north and southeast. This feature is more prominent when the Sun is at a relatively high angle. There are also multiple small crater impacts on the floor, most notably in the southeast.

Satellite 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 Schickard.
Schickard Latitude Longitude Diameter
A 46.9° S 53.6° W 14 km
B 43.6° S 51.9° W 13 km
C 45.8° S 55.8° W 13 km
D 45.7° S 57.4° W 9 km
E 47.2° S 51.6° W 32 km
F 48.1° S 53.6° W 17 km
G 43.0° S 58.9° W 12 km
H 43.5° S 62.2° W 16 km
J 45.0° S 62.1° W 11 km
K 43.9° S 63.8° W 16 km
L 44.1° S 59.6° W 7 km
M 44.2° S 58.9° W 7 km
N 41.3° S 54.6° W 6 km
P 42.9° S 48.3° W 92 km
Q 42.7° S 52.9° W 5 km
R 44.1° S 53.6° W 5 km
S 46.6° S 56.7° W 15 km
T 44.8° S 50.2° W 4 km
W 45.0° S 57.8° W 7 km
X 43.6° S 51.1° W 8 km
Y 47.3° S 57.2° W 5 km
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