Almanon (crater)
Encyclopedia
Almanon, named after Abbasid Caliph Al Ma'mun, is a lunar
impact crater
that lies in the rugged highlands in the south-central region of the Moon
. It is located to the south-southeast of Abulfeda
, and to the north-northeast of the smaller crater Geber
. The crater chain designated Catena Abulfeda
forms a line between the south rim of Abulfeda and the north rim of Almanon, continuing for a length of about 210 kilometers to the Rupes Altai
scarp
.
The rim of Almanon forms a slightly distorted circle, with outward bulges to the north and southwest. The crater pair Almanon A and Almanon B is attached to the exterior of the southern rim. The interior wall is wider along the eastern side than elsewhere. Small craters belonging to the Catena Abulfeda intrude slightly into the northeast rim. The outer wall is generally worn and lacks the crispness of a younger crater, but is not significantly impacted by subsequent cratering. The interior floor is relatively flat and lacks notable features other than a few tiny craterlets.
Moon
The Moon is Earth's only known natural satellite,There are a number of near-Earth asteroids including 3753 Cruithne that are co-orbital with Earth: their orbits bring them close to Earth for periods of time but then alter in the long term . These are quasi-satellites and not true moons. For more...
impact crater
Impact crater
In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body...
that lies in the rugged highlands in the south-central region of the Moon
Moon
The Moon is Earth's only known natural satellite,There are a number of near-Earth asteroids including 3753 Cruithne that are co-orbital with Earth: their orbits bring them close to Earth for periods of time but then alter in the long term . These are quasi-satellites and not true moons. For more...
. It is located to the south-southeast of Abulfeda
Abulfeda (crater)
Abulfeda is a lunar impact crater located in the central highlands of the Moon. To the northeast is the crater Descartes, and to the south-southeast is Almanon. To the north is the crater Dollond. A chain of craters named the Catena Abulfeda runs between the southern rim of Abulfeda and the north...
, and to the north-northeast of the smaller crater Geber
Geber (crater)
Geber is a lunar impact crater that is located in the rugged south-central highlands of the Moon. It lies half way between the crater Almanon to the north-northeast and the crater pair of Azophi and Abenezra to the south-southwest. Farther to the southeast is Sacrobosco...
. The crater chain designated Catena Abulfeda
Catena Abulfeda
Catena Abulfeda is a chain of craters on the Moon that runs between the southern rim of the crater Abulfeda and the north rim of Almanon, then continues for a length of 210 kilometers across the Rupes Altai. It is located at ....
forms a line between the south rim of Abulfeda and the north rim of Almanon, continuing for a length of about 210 kilometers to the Rupes Altai
Rupes Altai
Rupes Altai is an escarpment in the lunar surface that is located in the southeastern quadrant of the Moon's near side. It is named for the Altai Mountains in Asia. The selenographic coordinates of this feature are , and it has a length of about 427 km....
scarp
Escarpment
An escarpment is a steep slope or long cliff that occurs from erosion or faulting and separates two relatively level areas of differing elevations.-Description and variants:...
.
The rim of Almanon forms a slightly distorted circle, with outward bulges to the north and southwest. The crater pair Almanon A and Almanon B is attached to the exterior of the southern rim. The interior wall is wider along the eastern side than elsewhere. Small craters belonging to the Catena Abulfeda intrude slightly into the northeast rim. The outer wall is generally worn and lacks the crispness of a younger crater, but is not significantly impacted by subsequent cratering. The interior floor is relatively flat and lacks notable features other than a few tiny craterlets.
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 Almanon.| Almanon | Latitude | Longitude | Diameter |
|---|---|---|---|
| A | 17.7° S | 15.3° E | 10 km |
| B | 18.3° S | 15.3° E | 25 km |
| C | 16.1° S | 16.0° E | 16 km |
| D | 18.6° S | 15.6° E | 6 km |
| E | 17.9° S | 13.7° E | 5 km |
| F | 15.9° S | 14.3° E | 5 km |
| G | 17.8° S | 14.6° E | 5 km |
| H | 19.0° S | 15.3° E | 6 km |
| K | 15.8° S | 15.4° E | 8 km |
| L | 18.9° S | 16.6° E | 6 km |
| P | 18.5° S | 17.0° E | 8 km |
| Q | 18.1° S | 17.0° E | 5 km |
| R | 18.2° S | 15.9° E | 4 km |