Tycho is a prominent lunar impact crater locate in the southern lunar highlands, named after the danish astronomer Tycho Brahe. To the south is Street crater; to the east Pictet, and to the north-northeast is Sasserides crater. The surface around Tycho is replete with craters of various differing radii, many overlapping still older craters. Some of the smaller craters are secondary craters formed from larger chunks of ejecta from Tycho.