Gassendi (crater)

lunar crater data


caption=Oblique view of Gassendi from Apollo 16. "NASA photo."
latitude=17.5
N_or_S=S
longitude=39.9
E_or_W=W
diameter=110 km
depth=1.9 km
colong=40
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 intrudes 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 crater Gassendi A 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.

atellite 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.

References

External links

* cite web
last = Wood | first = Chuck | date = 2006-07-12
url = http://www.lpod.org/?m=20060712
title = Inside Gassendi | publisher = Lunar Photo of the Day
accessdate = 2006-07-12
* cite web
last = Wood | first = Chuck | date = December 22, 2007
url = http://www.lpod.org/?m=20071222
title = Unnecessary Mystery
publisher = Lunar Photo of the Day
accessdate = 2008-01-02
* [http://www.ast.cam.ac.uk/~ipswich/History/Clarkson.htm Trimley's Moon Man - Roland Clarkson] (accessed 9/16/05)