Cayley (crater)

lunar crater data
latitude=4.0
N_or_S=N
longitude=15.1
E_or_W=E
diameter=14 km
depth=3.1 km
colong=345
eponym=Arthur Cayley

Cayley is a small lunar impact crater that is located in a basaltic-lava-flooded region to the west of Mare Tranquillitatis. It lies to the northwest of the smaller De Morgan and the larger D'Arrest craters. West and slightly north of the crater is Whewell crater, a crater of about the same dimensions. To the north is a linear rille designated "Rima Ariadaeus", which follows a course to the east-southeast.

This is a circular, bowl-shaped formation with a small interior floor at the mid-point. (Small being relative to the overall diameter, as it occupies about one-fourth the total cross-section.) The sloping interior walls are relatively light in hue, having a higher albedo as the surrounding terrain. However it is not nearly as bright as the slightly larger Dionysius crater to the east-southeast, and lacks a ray system.

The type of smooth, rolling plains to the east of this crater are called "Cayley Formation". It is somewhat similar to the lunar mares, but has a slightly higher albedo and is overlapped at the eastern edge by the Mare Tranquillitatis. Lunar scientists suspect that this plain may have resulted from deposits of "ejecta" from the formation of large impact basins such as Mare Imbrium or Mare Orientale. (The most likely source is the Mare Imbrium impact basin to the northwest.)

References

*cite book
first=D. M. | last=Harland | year=1999
title=Exploring the Moon: The Apollo Expeditions
publisher=Springer | id=ISBN 1852330996
*cite web
author=Masursky, H.; Colton, G. W.; Farouk, E.-B.
year=1978
url=http://www.hq.nasa.gov/office/pao/History/SP-362/ch3.2.htm
title =Apollo Over the Moon: A View from Orbit (NASA SP-362)
publisher =NASA | accessdate=2006-08-10 — see Fig. 46
*cite journal
last = Wood | first = Charles A.
title=Looking Between Craters
journal=Sky & Telescope | date=March, 2006
*cite web
last = Wood | first = Chuck | date = 2007-08-15
url = http://www.lpod.org/?m=20070815
title = A Formation of Surprise
publisher = Lunar Photo of the Day
accessdate = 2007-07-15