|Lat: 66.1°S, Long: 103.2°E, Diam: 98 km, Depth: km, Rükl: (farside)|
left: Clementine . right: LROC . Sikorsky transected by Vallis Schrödinger ; the far (east) wall of Sikorsky (107°) is visible at the southeast limb during very favourable librations, the Vallis itself is not visible.
Igor Ivanovich; Russian-American aeronautical engineer (1889-1972).