Geological Chronicle
Prandtl is an impact crater measuring 87.53 kilometers in diameter on the far side of the Moon. It lies across the southeastern outer rim of the huge walled plain Planck. The feature is named for German physicist Ludwig Prandtl (1875–1953).
On the lunar geologic timescale, Prandtl dates to the Nectarian period. The crater is roughly circular, but with an outward bulge to the south-southeast. Its rim is worn but still retains a well-defined edge.
The interior floor is generally level, with only a small rise south of the midpoint. Several small craterlets lie along the rim and inner wall, most notably a pair of small craters along the eastern side and a small, eroded crater intruding slightly along the south. A cluster of three small craterlets also sits along the southern inner wall.