Gassendi (crater)
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| Crater characteristics | |
|---|---|
| Coordinates | 17.5° S, 39.9° W |
| Diameter | 110 km |
| Depth | 1.9 km |
| Colongitude | 40° at sunrise |
| Eponym | Pierre Gassendi |
Gassendi is a large lunar crater feature located at the northern edge of Mare Humorum. The formation has been inundated by lava during the formation of the mare, so only the rim and the multiple central peaks remain above the surface. The outer rim is worn and eroded, although it retains a generally circular form. A smaller crater 'Gassendi A' is intruding into the northern rim, and joins a rough uplift at the northwest part of the floor. The crater pair bears a curious resemblance to a diamond ring.
In the southern part of the crater floor is a semi-circular ridge-like formation that is concentric with the outer rim. It is in the southern part where the rim dips down to its lowest portion, and a gap appears at the most southern point. The rim varies in height from as little as 200 meters to as high as 2.5 kilometers above the surface. The floor has numerous hummocks and rough spots. There is also a system of rilles that criss-cross the floor, named the Rimae Gassendi.
On some older maps the 'Gassendi A' crater was called "Clarkson", after the British amateur astronomer and selenographer Roland L T Clarkson, but this name is not officially recognized by the IAU and the name has been removed.
[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 Gassendi crater.
| Gassendi | Latitude | Longitude | Diameter |
|---|---|---|---|
| A | 15.5° S | 39.7° W | 33 km |
| B | 14.7° S | 40.6° W | 26 km |
| E | 18.4° S | 43.5° W | 8 km |
| F | 15.0° S | 45.0° W | 8 km |
| G | 16.8° S | 44.6° W | 8 km |
| J | 21.6° S | 37.0° W | 9 km |
| K | 18.7° S | 43.6° W | 6 km |
| L | 20.4° S | 41.8° W | 6 km |
| M | 18.6° S | 39.0° W | 3 km |
| N | 18.0° S | 39.2° W | 3 km |
| O | 21.9° S | 35.1° W | 11 km |
| P | 17.2° S | 40.6° W | 2 km |
| R | 21.9° S | 37.7° W | 3 km |
| T | 19.0° S | 35.4° W | 10 km |
| W | 17.6° S | 43.7° W | 6 km |
| Y | 20.8° S | 38.3° W | 5 km |
[edit] References
- See the reference table for the general listing of literature and web sites that were used in the compilation of this page.
- Wood, Chuck (2006-07-12). Inside Gassendi (English). Lunar Photo of the Day. Retrieved on 2006-07-12.
[edit] External links
- Trimley's Moon Man - Roland Clarkson (accessed 9/16/05)
