Geological Chronicle
Robertson is a mostly intact lunar impact crater located on the far side of the Moon, just beyond the western limb. Measuring 89.85 kilometers across, it lies south of Berkner, a formation of comparable size with more eroded features. The crater is bordered to the east by Helberg and to the southwest by Alter.
Dating to the Copernican period on the lunar geologic timescale, Robertson is approximately circular with an irregular outline where wall terraces have slumped away. The inner wall of the rim contains wide, complex layers of multiple terraces, while a central peak at the midpoint connects to a rugged stretch of ground extending toward the northeastern rim.
A band of light-hued ray material from Ohm covers the southern half of the crater floor and rim. Prior to its formal naming by the International Astronomical Union in 1970 in honor of American physicist and mathematician Howard Percy Robertson, the crater was designated Crater 177.