Fermat (crater)

Short description: Crater on the Moon

Fermat

Lunar Orbiter 4 image

Diameter| 37.77 km
Depth| 2.0 km
Colongitude| 20° at sunrise
Selenochromatic Image (Si) of the crater area

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 France mathematician Pierre de Fermat.[3][1]

## 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 Fermat.[4]

Fermat  | Coordinates  | Diameter

|
|

A  |  [ ⚑ ] 21°48′S 19°36′E﻿ / ﻿21.8°S 19.6°E﻿ / -21.8; 19.6 | 17 km
B  |  [ ⚑ ] 23°00′S 21°06′E﻿ / ﻿23.0°S 21.1°E﻿ / -23.0; 21.1 | 11 km
C  |  [ ⚑ ] 21°00′S 18°30′E﻿ / ﻿21.0°S 18.5°E﻿ / -21.0; 18.5 | 14 km
D  |  [ ⚑ ] 20°06′S 18°00′E﻿ / ﻿20.1°S 18.0°E﻿ / -20.1; 18.0 | 13 km
E  |  [ ⚑ ] 19°54′S 19°54′E﻿ / ﻿19.9°S 19.9°E﻿ / -19.9; 19.9 | 7 km
F  |  [ ⚑ ] 22°06′S 20°12′E﻿ / ﻿22.1°S 20.2°E﻿ / -22.1; 20.2 | 5 km
G  |  [ ⚑ ] 19°24′S 20°00′E﻿ / ﻿19.4°S 20.0°E﻿ / -19.4; 20.0 | 7 km
H  |  [ ⚑ ] 23°06′S 20°42′E﻿ / ﻿23.1°S 20.7°E﻿ / -23.1; 20.7 | 5 km
P  |  [ ⚑ ] 23°36′S 19°18′E﻿ / ﻿23.6°S 19.3°E﻿ / -23.6; 19.3 | 37 km

## References

1. ↑ 1.0 1.1 1.2 Autostar Suite Astronomer Edition. CD-ROM. Meade, April 2006.
2. ↑ Atlas of the Moon. Kalmbach Books. 1990. ISBN 0-913135-17-8.
3. ↑ "Fermat (crater)". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
4. ↑ Bussey, B.; Spudis, P. (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. ISBN 0-521-81528-2.

## External links

* Fermat at The Moon Wiki

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