Named for the impact crater in southwestern Germany, 10 km west of the town of Heidenheim on the river Brenz. The rim of the crater has a diameter of 4 km, and its central hillock is named Steinhirt-Klosterberg. The larger and more famous Ries crater {see planet  (4327)} is located some 40 km away. Both impacts have an age of 14.5 million years, and it is very probable that they were formed simultaneously by an impactor that fragmented. (M 26425) _ _.