Geological Chronicle
Sikorsky sits behind the Moon's southeastern limb on the far side, lying just out of sight from Earth to the northwest of the enormous walled plain Schrödinger. Spanning a diameter of 97.67 kilometers, the crater displays a heavily eroded formation whose outer rim has been worn and rounded by a long history of lesser impacts.
In 1967, high-resolution photography from Lunar Orbiter 4 revealed a 310-kilometer gouge slicing straight through the middle of Sikorsky. Radial to the Schrödinger basin, this linear formation was later named Vallis Schrödinger. A lesser cleft also cuts into the eastern rim from the south-southeast.
Discounting the valley that bisects the floor, the interior surface remains relatively level and featureless, marked by only a few tiny craterlets. At nearly the exact midpoint of the floor, the bowl-shaped satellite crater Sikorsky Q intrudes into the western side of Vallis Schrödinger.
The crater commemorates Igor Ivanovich Sikorsky, the Russian-American aeronautical engineer and aviation pioneer.