Sirsalis (crater)
Encyclopedia
Sirsalis is a relatively young lunar
impact crater
located near the western lunar limb, to the southwest of the Oceanus Procellarum
. The crater lies across a ridge that runs in a north–south direction. It has a sharp edge and a low central peak. The crater overlaps the slightly larger and older Sirsalis A to the west-southwest, and the two form a distinctive feature.
To the east is a rille
system named the Rimae Sirsalis
. The longest of these rilles follows a line running approximately north-northeast to south-southwest, just clearing the southeastern rim of Sirsalis by about 10 kilometers. This long rille runs 330 kilometers from the shore of Oceanus Procellarum until it crosses the crater Darwin A and intersects the Rimae Darwin to the east of Darwin
.
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...
located near the western lunar limb, to the southwest of the Oceanus Procellarum
Oceanus Procellarum
Oceanus Procellarum is a vast lunar mare on the western edge of the near side of the Earth's Moon. Its name derives from the old superstition that its appearance during the second quarter heralded bad weather...
. The crater lies across a ridge that runs in a north–south direction. It has a sharp edge and a low central peak. The crater overlaps the slightly larger and older Sirsalis A to the west-southwest, and the two form a distinctive feature.
To the east is a rille
Rille
Rille is typically used to describe any of the long, narrow depressions in the lunar surface that resemble channels. Typically a rille can be up to several kilometers wide and hundreds of kilometers in length...
system named the Rimae Sirsalis
Rimae Sirsalis
Rimae Sirsalis is a lunar rille. It is located at and is 426 km long. It was formed by extension of the surface, possibly due to dike propagation in the subsurface.Rimae Sirsalis cuts across highlands almost exclusively...
. The longest of these rilles follows a line running approximately north-northeast to south-southwest, just clearing the southeastern rim of Sirsalis by about 10 kilometers. This long rille runs 330 kilometers from the shore of Oceanus Procellarum until it crosses the crater Darwin A and intersects the Rimae Darwin to the east of Darwin
Darwin (lunar crater)
Darwin is a lunar crater of the type categorised as a walled plain. It lies in the southeastern part of the Moon, and is sufficiently close to the limb to appear significantly foreshortened when viewed from the Earth. Attached to its southern rim is Lamarck...
.
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 Sirsalis.| Sirsalis | Latitude | Longitude | Diameter |
|---|---|---|---|
| A | 12.7° S | 61.3° W | 49 km |
| B | 11.1° S | 63.7° W | 16 km |
| C | 10.3° S | 63.8° W | 22 km |
| D | 9.9° S | 58.6° W | 35 km |
| E | 8.1° S | 56.5° W | 72 km |
| F | 13.5° S | 60.1° W | 13 km |
| G | 13.7° S | 61.7° W | 30 km |
| H | 14.0° S | 62.4° W | 26 km |
| J | 13.4° S | 59.8° W | 12 km |
| K | 10.4° S | 57.3° W | 7 km |
| T | 9.2° S | 53.4° W | 16 km |
| Z | 10.7° S | 61.9° W | 91 km |