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(English version,
Wikipedia copyright)
Alphonsus is an
ancient impact crater on Earth's Moon that dates from the immediate post-Nectarian
era. It is located on the lunar highlands on the eastern end of Mare Nubium,
west of the Imbrian Highlands, and slightly overlaps the Ptolemaeus crater
to the north. The surface is broken and irregular along this boundary. The
outer walls are slightly distorted in form and possess a somewhat hexagonal
form. To the northwest is the smaller
Alpetragius crater.
A low ridge system of
deposited ejecta bisects the crater floor, and includes the steep
central peak designated Alpha (α) Alphonsus. This pyramid-shaped formation rises to a height of 1.5 km
above the interior surface. It is not volcanic in origin, but rather is made
of anorthosite like the lunar highlands.
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