991 McDonalda
991 McDonalda is a Themistian asteroid. It was discovered by Otto Struve in 1922 at the Yerkes Observatory in Williams Bay, Wisconsin, United States. It is named after the McDonald Observatory, which Struve helped found in 1939. References External links 000991 Discoveries by Otto Struve Named minor planets 991 McDonalda 000991 19221024