Sosigenes ( crater ) Crater characteristics Coordinates 8.7° N , 17.6° E Diameter 18 km Depth 1.7 km Colongitude    342° at sunrise Eponym Sosigenes Sosigenes is a lunar impact crater on the west edge of Mare Tranquillitatis . It lies to the east of the large Julius Caesar walled-plain . The crater rim has a high albedo , making it relatively bright . It has a small central rise at the mid-point of the floor . To the east on the mare is formation of parallel rilles designated the Rimae Sosignes . These follow a course to the north , and have a length of about 150 kilometers . The small , bowl-shaped crater 'Sosignes A ' lies across one of these rilles . Satellite craters By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Sosigenes crater . Sosigenes Latitude Longitude Diameter A 7.8° N 18.5° E 12 km B 8.3° N 17.2° E 4 km C 7.2° N 18.9° E 3 km References See the reference table for the general listing of literature and web sites that were used in the compilation of this page . Categories : Craters on the Moon 8.7 N 17.6 E 18 km 1.7 km 342 Sosigenes 