Planck (crater)

Planck (crater)

lunar crater data
latitude=57.9
N_or_S=S
longitude=136.8
E_or_W=E
diameter=314 km
depth="Unknown"
colong=234
eponym=Max Planck

Planck is a huge lunar crater that is located in the southern hemisphere of the Moon, on the far side as seen from the Earth. It lies to the west of the Poincaré walled plain, another enormous formation only slightly larger than Planck. Both formations are larger than the Deslandres walled plain, the largest crater on the near side. Lying across the southeast rim of Planck is the Prandtl crater.

Like many lunar formations of this size, the outer rim has been damaged and eroded by lesser impacts, leaving a rugged ring of peaks and ridges that is notched and incised by small craters. The western rim of this walled plain is neatly overlain by a long lunar valley designated the Vallis Planck. Despite its name, however, this valley is actually radial to the Schrödinger walled plain to the south. The valley as a length of about 451 kilometers.

The most notable feature on the interior floor of Planck is a multi-crater formation in the northern half consisting of 'Planck W', 'Planck Y', 'Planck Z', 'Planck B', and 'Planck A'. The interior of 'Planck Y' has been almost completely flooded by lava, leaving only a shallow perimeter. Likewise 'Planck Z' has been flooded, although its rim is somewhat more prominent. The interior of 'Planck B' is partly occupied by a concentric crater, and the floor contains several clefts. Parts of the remaining floor of Planck are level and smooth, at least in comparison with the surrounding terrain. This is particularly so in an arc along the northern inner wall. The southern half of the crater is somewhat more irregular, although still forming level plains in places. There are many small craters across the interior of Planck, and a few ghost-crater remnants.

atellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Planck crater.

References

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