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Apollo is a double-ringed walled plain (or basin) whose inner ring is roughly half the diameter of the outer wall. Both the outer wall and the interior have been heavily worn and eroded by subsequent impacts, so that significant parts of the outer and inner walls now consist of irregular and incised sections of mountainous arcs.
Herodotus Omega (Lunar Orbiter 4 image) Herodotus is a lunar impact crater located on a low shelf in the midst of the Oceanus Procellarum. To the east is the slightly larger crater Aristarchus. West across the mare is Schiaparelli. Almost due south on the mare surface is a solitary lunar dome designated Herodotus Omega (ω).
The selenographic coordinates of the bay's center are 45.01° N, 31.67° W, and the diameter is 249 km. [1] It was the planned landing site of Chang'e 3, China's 2013 lunar exploration mission, which instead landed nearby in Mare Imbrium.
Rhaeticus is a lunar impact crater that lies astride the equator of the Moon, on the southeast edge of the Sinus Medii. To the north-northwest is the crater Triesnecker, and due south can be found the worn remnant of the walled plain Hipparchus. The crater was named after Austrian astronomer Georg Joachim Rheticus. [1] [2]
Aristarchus is a lunar impact crater that lies in the northwest part of the Moon's near side. It is considered the brightest of the large formations on the lunar surface, with an albedo nearly double that of most lunar features.
Posidonius is a lunar impact crater that is located on the north-eastern edge of Mare Serenitatis, to the south of Lacus Somniorum. It was named after ancient Greek philosopher and geographer Posidonius of Apamea. [ 1 ]
Oblique view from Lunar Orbiter 5 Close up of Schrödinger G, the low-albedo area within Schrödinger, which is interpreted as a volcanic vent, similar to those in Alphonsus on the near side. Schrödinger is a large lunar impact crater of the form traditionally called a walled plain and is named after Erwin Schrödinger .
The nearest craters of note are Cabeus to the west, and Shoemaker to the south-southeast and nearer to the south pole of the Moon. Lunar south polar region map (>80°S). Aerial view of the lunar south polar region with Malapert crater marked. The rim of Malapert forms an irregular ring of peaks around the interior floor.