Owen Gingerich24 August 2006
The International Astronomical Union adopts a planet definition that places Pluto in the new dwarf-planet category.
United States of America · Science / Astronomy. Chronological records rendered directly from the World History Database.
The International Astronomical Union adopts a planet definition that places Pluto in the new dwarf-planet category.
The Minor Planet Center assigns Pluto the permanent minor-planet number 134340 following its dwarf-planet reclassification.
This factsheet is generated from stored World History Database records matching the country, broad category, detailed category and exact Event value shown above. Duplicate display records are collapsed; database wording is otherwise preserved. Source provenance varies by record, so formal academic citation should be checked against the relevant primary source, archive or specialist historical reference.