Messala (crater)


Messala is a lunar impact crater of sufficient dimension to belong to the category of impact features known as walled plains. It is located in the northeastern part of the Moon, close enough to the rim to appear significantly foreshortened. Nearly attached to the northern rim is the crater Schumacher. To the southwest is the prominent crater Geminus, and due south is the smaller Bernoulli.
The outer rim of this formation has received a significant amount of erosion due to minor impacts, but much of the outer wall retains its original shape and a certain degree of. The rim is broken by smaller craters along the south, north, and northwest sides, designated Messala B, J, and K, respectively. Messala J has a narrow gouge in its eastern rim leading one crater diameter to the east. It is attached to a slightly larger crater which lies across the southern rim of Schumacher.
The interior floor is relatively level but contains irregularities in the surface at some locations. There are several small craters across the floor, which are now little more than low rims and depressions in the surface. The most notable of these is a ghost crater along the western inner wall.

Origin of name

The crater is named after Masha'allah ibn Atharī, a Persian Jewish astrologer and astronomer from the city of Basra who was the leading astrologer of the late 8th century. Masha'allah was one of the most prominent members of the commission which decided the Caliph al-Mansur that the propitious moment for the founding of Baghdad fell on 30 July 762.

Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Messala.
MessalaLatitudeLongitudeDiameter
A36.6° N53.8° E26 km
B37.4° N59.9° E18 km
C40.9° N65.8° E12 km
D40.5° N67.8° E28 km
E40.0° N64.9° E40 km
F38.9° N64.4° E32 km
G39.1° N68.6° E29 km
J41.1° N61.2° E15 km
K41.1° N58.5° E13 km