Riemann (crater)
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| Crater characteristics | |
|---|---|
| Coordinates | 39.5° N, 87.2° E |
| Diameter | 110 km |
| Depth | Unknown |
| Colongitude | 274° at sunrise |
| Eponym | G. F. Bernhard Riemann |
Riemann (pronounced REE mahn) is a lunar crater that is located near the northeastern limb of the Moon, and can just be observed from the side when libration effects bring it into sight. It lies to the east-northeast of the large Gauss walled plain. To the southeast, beyond sight on the far side, is the Vestine crater.
This is a heavily battered and eroded formation that is only a remnant of its former self. The outer rim has been worn away in many places, and now forms an irregular series of ridges in a rough circle. The rim is overlaid along the south-southwestern rim by Beals crater, and several smaller craters lie along the western and southeast rim. The most intact portion of the outer wall is along the eastern edge.
The interior floor is a mixture of level terrain mixed with rough ground where impacts have stirred up the surface. It is generally less rough in the eastern half, especially near the center. A small, bowl-shaped crater lies on the floor in the southeastern part of the interior, and the faint remnants of several other lesser craters can be observed in the surface.
[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 Riemann crater.
| Riemann | Latitude | Longitude | Diameter |
|---|---|---|---|
| B | 41.6° N | 85.2° E | 24 km |
| J | 37.4° N | 90.2° E | 39 km |
The following craters have been renamed by the IAU.
- Riemann A — See Beals crater.
[edit] References
- See the reference table for the general listing of literature and web sites that were used in the compilation of this page.
