Geological Chronicle
Located on the lunar far side, Neujmin measures 97.03 kilometers across and lies southwest of the prominent crater Tsiolkovskiy. The formation sits nearly attached to the west-southwest of the smaller crater Waterman within the Fermi quadrangle.
Subsequent impacts have degraded and distorted the crater's structure. The circular crater Neujmin P cuts across the southwestern rim, while the northern and southern rims are disrupted. Small craterlets along the northwestern rim and inner wall represent likely secondary impacts from Tsiolkovskiy.
On the crater floor, a dark-halo crater reveals darker material beneath the surface, pointing to buried mare lava. The International Astronomical Union officially named the crater in 1970 in honor of Soviet astronomer Grigory N. Neujmin.