is a small
Lunar Impact Crater that lies near the north end of
Sinus Amoris , a bay on the northern part of
Mare Tranquillitatis . The crater lies just to the southeast of
Brewster Crater , and further to the south of
Römer Crater . Franck crater was previously designated 'Römer K' before being given a unique name by the
IAU .
This is a circular, bowl-shaped crater with a sharp rim that has not been significantly eroded. The interior walls slope down to the tiny floor at the mid-point. Just to the north of Franck is a joined pair of smaller craters, and the three nearly form a merged cluster of impacts.
