Home | Gallery of astronomical pictures | Moon | Walther-Aliacensis-Werner_05062014_141301-UT
(Freely adapted from Wikipedia)
Walther is an ancient lunar impact crater (dia. 132x140 Km, dept. 4.1 Km) located in the southern highland region of the Moon.
The rim of Walther is complex, heavily eroded and incised by lesser impacts. The wall retains a generally circular form, but many of its features have been worn away and there is a slight protruding bulge in the western rim. The floor has been resurfaced after the original impact, leaving the southwestern half relatively smooth. In the northwest quadrant is an offset central peak that has been worn and impacted by several small craters. Walther is named after the German astronomer Bernhard Walther.
Aliacensis is a lunar impact crater (dia. 79 Km, dept. 3.7 Km) that is located in the rugged southern highlands of the Moon. The crater is named after 14th century French geographer and theologian Pierre d'Ailly.
The rim of Aliacensis is generally circular, with an outward bulge on the eastern wall. The inner wall has some slight terracing particularly in the northeast. There is a small crater located across the southern rim. The interior floor is generally flat, with a low central peak slightly offset to the northwest of the midpoint. South of it lie two somewhat broken rings, Kaiser and Nonius. It is 52 kilometers in diameter and there is a 3.7 kilometer difference in height between its deepest part and its rim.
Werner is a prominent lunar impact crater (dia. 70 Km, dept. 4.2 Km) that lies in the rugged south-central highlands of the Moon. It is almost joined with the crater Aliacensis to the southeast, and the pair form a rugged valley in the intervening gap. The crater is named after the 15th-century German mathematician and astronomer Johannes Werner.
The rim of Werner shows little appearance of wear, and is much younger and less eroded than the other large craters in the surroundings. The interior wall is terraced, and there is a noticeable rampart on the exterior. There are several low rises on the crater floor and a notable central peak. Its highly terraced walls attain peaks of almost 1,500 feet.
Near the Werner crater, a Clair-obscur effect created by the dark craters and their lit rims is visible for several hours before first quarter forms an x (also known as the Werner X).
Not yet rated
