What are the twelve planets on Dumbledore's watch?

  • Mercury
  • Venus
  • Earth
  • Mars
  • Ceres
  • Jupiter
  • Saturn
  • Uranus
  • Neptune
  • Pluto
  • Haumea (discovered 2004, not spherical)
  • Makemake (discovered 2005)
  • Eris (discovered 2005)

How did JK know of the other dwarf planets prior to their discovery?

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