Geological Chronicle
Isaev is a lunar impact crater on the far side of the Moon, measuring 94.1 kilometers in diameter. It is entirely contained within the northwestern part of the floor of the much larger walled plain Gagarin. The northwestern outer rim of Isaev is attached directly to the inner rim of Gagarin.
Although younger than Gagarin, the crater remains an eroded formation. Its southern rim is breached where the smaller satellite crater Isaev N breaks through. Tiny craterlets lie along the rim and inner walls of Isaev, while a short chain of craterlets forms a gouge along the western inner wall.
Within the interior floor lies a large triple-lobed area of lower-albedo material, a type of darker surface typically formed by flows of basaltic lava. The crater is named for Soviet rocket designer Alexei Mikhailovich Isaev.