Birkhoff (crater)
{{Short description|Crater on the Moon}}
{{no footnotes|date=July 2011}}
{{Infobox Lunar crater
| image = Normal birkoff.jpg
| caption = Clementine mosaic
| coordinates = {{coord|58.7|N|146.1|W|globe:moon_type:landmark|display=inline,title}}
| diameter = 345 km
| depth = Unknown
| colong = 156
| eponym = George Birkhoff
}}
Image:Birkhoff crater 5028 h3 med.jpg images, facing west]]
File:Birkhoff crater 5029 h2.jpg
File:Normal Birkhoff Basin LIDAR LTVT.jpg
Birkhoff is a giant lunar walled plain that is located on the far side of the Moon, in the northern hemisphere. This formation is an ancient impact site that has been heavily eroded, and the surface reshaped by multiple craters in the interior and along the rim. The outer wall is bordered by the craters Carnot to the south, Rowland along the west rim, and Stebbins to the north. Just to the northeast is van't Hoff.
What remains of the perimeter is now a rugged sloping rise along the inner wall, and the rim has been worn down until it is level with the irregular external terrain. The rim is pock-marked by small craters of various dimensions. Within the crater are several craters that are notable in their own right. Along the northwest inner rim is the eroded Birkhoff X, while due south in the southwest floor is Birkhoff Q. The later is joined by a low ridge to the double crater formation of Birkhoff K and L in the eastern half of the crater. In the northern interior are the smaller but relatively young Birkhoff Y and Z. The remainder of the floor is flat in places, with rough sections and many tiny craterlets.
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 Birkhoff.
| class="wikitable"
!width="25%" style="background:#eeeeee;" |Birkhoff !width="25%" style="background:#eeeeee;" |Latitude !width="25%" style="background:#eeeeee;" |Longitude !width="25%" style="background:#eeeeee;" |Diameter |
| align="center"|K
|align="center"|57.8° N |align="center"|144.3° W |align="center"|58 km |
| align="center"|L
|align="center"|56.6° N |align="center"|144.8° W |align="center"|37 km |
| align="center"|M
|align="center"|54.7° N |align="center"|144.8° W |align="center"|23 km |
| align="center"|Q
|align="center"|56.6° N |align="center"|150.8° W |align="center"|43 km |
| align="center"|R
|align="center"|57.5° N |align="center"|153.0° W |align="center"|27 km |
| align="center"|X
|align="center"|62.1° N |align="center"|149.7° W |align="center"|77 km |
| align="center"|Y
|align="center"|59.9° N |align="center"|146.6° W |align="center"|25 km |
| align="center"|Z
|align="center"|61.3° N |align="center"|145.3° W |align="center"|30 km |
References
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| title = NASA Catalogue of Lunar Nomenclature
| publisher = NASA RP-1097
}}
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}}
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}}
{{refend}}
{{Craters on the Moon: A–B}}