   diophantus is a lunar impact crater that lies in the southwestern part of the mare imbrium. it forms a pair with the larger crater delisle to the north. diophantus has a wide inner wall and a low central rise. to the north of diophantus is the sinuous rille designated rima diophantus, named after the crater. there is a tiny craterlet near the exterior of the southwest wall. ==rima diophantus== this cleft follows a generally eastâwest path across the mare imbrium. it is centered at selenographic coordinates 31.0Â° n, 32.0Â° w, and has a maximum diameter of 150&nbsp;km. several tiny craters near this rille have been assigned names by the iau. these are listed in the table below. {| class="wikitable" !style="background:#eeeeee;" |crater !style="background:#eeeeee;" |coordinates !style="background:#eeeeee;" |diameter !style="background:#eeeeee;" |name source |- |isabel | |align="right"|1&nbsp;km |spanish feminine name |- |louise | |align="right"|0.8&nbsp;km |french feminine name |- |samir | |align="right"|2&nbsp;km |arabic masculine name |- |walter1 | |align="right"|1&nbsp;km |german masculine name |} {| |valign="top"|1 |not to be confused with the large crater walther in the southern hemisphere which is misidentified as 'walter' in some publications |} the crater samir has bright rays that extend for over 70 km. ==satellite craters== by convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to diophantus. {| class="wikitable" !width="25%" style="background:#eeeeee;" |diophantus !width="25%" style="background:#eeeeee;" |latitude !width="25%" style="background:#eeeeee;" |longitude !width="25%" style="background:#eeeeee;" |diameter |- |align="center&qu
Impact_craters_on_the_Moon LQ11_quadrangle