Walker is a
lunar impact crater
An impact crater is a depression (geology), depression in the surface of a solid astronomical body formed by the hypervelocity impact event, impact of a smaller object. In contrast to volcanic craters, which result from explosion or internal c ...
that lies on the
far side of the
Moon
The Moon is Earth's only natural satellite. It Orbit of the Moon, orbits around Earth at Lunar distance, an average distance of (; about 30 times Earth diameter, Earth's diameter). The Moon rotation, rotates, with a rotation period (lunar ...
. It is located to the northwest of the huge walled plain
Apollo
Apollo is one of the Twelve Olympians, Olympian deities in Ancient Greek religion, ancient Greek and Ancient Roman religion, Roman religion and Greek mythology, Greek and Roman mythology. Apollo has been recognized as a god of archery, mu ...
. Walker lies equidistant between the craters
Plummer to the east and
Rumford to the west-southwest.
This crater is roughly circular, with an outer rim that has been slightly worn due to minor impacts. The northwestern rim in particular has merged with a smaller crater, and another impact lies on the interior floor along the west-northwestern inner wall.
Satellite craters
By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Walker.
References
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Impact craters on the Moon