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991
McDonald's
991 McDonalda
Asteroid
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.
Wikipedia
Orbits
:
Sun
Discovered by
:
O. Struve