Birmingham (crater)

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Crater characteristics
Location of the Birmingham crater.
Coordinates	65.1° N, 10.5° W
Diameter	92 km
Depth	1.8 km
Colongitude	13° at sunrise
Eponym	John Birmingham

Birmingham is the surviving remnant of a lunar crater. It is located near the northern limb of the Moon, and so is viewed from the Earth at a low angle. All that survives of the original formation is an irregular perimeter of low, indented ridges surrounding the lava-resurfaced interior. The inner floor is marked by several tiny craterlets, and the surface is unusually rough for a walled plain. The low angle of illumination allows fine details of this boulder-strewn field to be seen more clearly.

The Birmingham formation lies just to the north of the Mare Frigoris, and to the east of the W. Bond walled-plain. To the northeast is the smaller Epigenes crater, and Fontenelle crater lies to the northwest.

[edit] 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 Birmingham crater.