Nielsen ( crater ) Crater characteristics Coordinates 31.8° N , 51.8° W Diameter 10 km Depth Unknown Colongitude    52° at sunrise Eponym Axel V. Nielsen Harald H. Nielsen Nielsen is a small lunar impact crater on the Oceanus Procellarum . To the east-southeast is the Wollaston crater . Nielsen is a bowl-shaped formation that lies astride a small ridge that runs north-northwest toward the Mons Rümker . The later is an unusual raised formation of lunar domes . References See the reference table for the general listing of literature and web sites that were used in the compilation of this page . Categories : Craters on the Moon 31.8 N 51.8 W 10 km Unknown 52 Axel V. Nielsen Harald H. Nielsen 