• Chronologically
  

  $10, Peter Goldreich, that a Saturn ringlet was not constrained by an invisible shepherd satellite, paid slowly in $1 bills over 3 weeks, 1981
  

  $500, Brian Marsden, that 1992 QB1 is not a long-period comet, paid in 1996, 1992.
  

  $100, Hilke Schlichting, about Jonathan Mitchell, paid, 2015?
  

  $100, Carolina Lithgow-Bertelloni, about Hilke Schlichting, 2023, unpaid
  

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Jewitt