| Coordinates: | -22.71°N 19.79°W |
| Diameter: | 37.77 km |
| Depth: | 2.0 km |
| Colong: | 20 |
| Eponym: | Pierre de Fermat |
Fermat is a lunar impact crater located to the west of the Rupes Altai escarpment. To the west-southwest is the larger crater Sacrobosco, and to the southwest is the irregular Pons. It is 39 kilometers in diameter and two kilometers deep.[1]
The rim of Fermat is worn and somewhat irregular, but still possesses an outer rampart. The north rim is indented by a double crater formation that includes Fermat A. The floor is relatively flat and does not have a central rise.[2] The crater is from the Pre-Imbrian period, 4.55 to 3.85 billion years ago.[1]
It is named for 17th century French mathematician Pierre de Fermat.[1]
By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Fermat.[3]
| Fermat | Coordinates | Diameter | |
|---|---|---|---|
| A | 17 km | ||
| B | 11 km | ||
| C | 14 km | ||
| D | 13 km | ||
| E | 7 km | ||
| F | 5 km | ||
| G | 7 km | ||
| H | 5 km | ||
| P | 37 km |