Clark (lunar crater)

Clark is a lunar impact crater that lies in the southern hemisphere of the Moon's far side.^[2] It is located midway between the larger walled plain named Van der Waals to the south and the similar-sized crater Pizzetti to the north.^[3]

The inner wall of Clark lacks well-formed terraces, but instead forms a narrow ridge with a wide rampart sloping down to the central floor. The rim is roughly circular, but eroded in places. A small crater lies across the southern rim, and a tiny pair are located along the northeastern crest. There is a slight outward bulge along the wall along the west-southwestern side. The crater floor is marked by a number of tiny craterlets but otherwise relatively featureless, having no central peak.^[4]: 117

This crater is named for American astronomer and telescope maker Alvan Clark (1804–1887) and his son Alvan Graham Clark (1832–1897).^[5] Its designation was officially adopted by the International Astronomical Union in 1970.^[1]