Tycho is an impact crater formed approximately 100 million years ago.  It is the most recent large impact crater on the Moon's near side.  Tycho is circular in form with a diameter of 52 miles and has very high and steep walls rising approximately 14.500 feet (4800 meters).  It has a relative flat floor with a central mountain peak rising to a height of approximately 4,800 feet (1600 meters).  It can be best observed just after First or Last Quarter with the aid of even small telescopes.