Kästner is a lunar impact crater that is located near the eastern limb of the Moon, to the southwest of the Mare Smythii. Just to the northwest of Kästner is the walled plain Gilbert. To the south is the prominent crater Ansgarius, and to the southwest lies La Pérouse.
Oblique Lunar Orbiter 4 image
Oblique view centered on Kästner from Apollo 12, facing northwest
Oblique view from Apollo 14
Mare Smythii is a lunar mare located along the equator on the easternmost edge of the Moon's near side, named for the 19th-century British astronomer William Henry Smyth. It is one of only two lunar maria that are named after people, the other being Mare Humboldtianum.
Mare Smythii
The topography (top) and corresponding gravity (bottom) signal of Mare Smythii reveals a mascon in its center
View from Apollo 10
Oblique view from Apollo 16