Wallach (crater)

Wallach

Apollo 15 mapping camera image
Coordinates	4°54′N 32°18′E / 4.9°N 32.3°E / 4.9; 32.3Coordinates: 4°54′N 32°18′E / 4.9°N 32.3°E / 4.9; 32.3
Diameter	6 km
Depth	1.1 km
Colongitude	328° at sunrise
Eponym	Otto Wallach

Wallach is a tiny lunar impact crater located in the eastern Mare Tranquillitatis. It is a circular, bowl-shaped feature with a negligible interior floor; the inner walls just slope down to the midpoint of the crater. Wallach is located to the northeast of the crater Maskelyne, near some low ridges in the lunar mare. Also Sinas is to the north, Aryabhata to the east-northeast and Menzel, half the size of Wallach is to the east. It was previously identified as Maskelyne H before being given a name by the IAU.

An unusual and apparently unnamed elongate crater about 2 km x 5 km in size and about 44 km east of Wallach was the subject of a landmark tracking exercise on Apollo 8 in December 1968. The feature was photographed repeatedly from its emergence on the horizon to after the Command Module had passed directly over it.