Mach is a large
lunarimpact crater of the class known as a walled plain. It is located on the
far side of the
Moon and cannot be viewed directly from the
Earth. Nearby craters of note include
Joule to the northeast,
Mitra attached to the western outer rim, and
Henyey to the southwest.
This is a prominent but eroded formation with multiple craters along the rim and interior. The crater
Harvey breaks across the eastern rim, and its outer
rampart spills across the interior floor of Mach. The overall shape of Mach resembles a
pear, with a prominent outward bulge to the northeast. Such a bulge can be caused by a second, merged crater. The northern edge is also the most worn and overlain by impacts.
The interior of Mach is marked by several small craters, particularly in the northeastern bulge. Several craters also lie along the edges to the west and northwest. The remainder of the interior floor is relatively level, when compared to the
terrain that surrounds Mach. There is a formation of central ridges near the midpoint of the crater.
Menzel, D. H.; Minnaert, M.; Levin, B.; Dollfus, A.; Bell, B. (1971). "Report on Lunar Nomenclature by the Working Group of Commission 17 of the IAU". Space Science Reviews. 12 (2): 136–186.
Bibcode:
1971SSRv...12..136M.
doi:
10.1007/BF00171763.
S2CID122125855.