421P/McNaught

Japanese version
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 Updated on May 29, 2022

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* Returns and Appearances

!Discovered *Appeared -Not observed #Appeared before discovery +Not observed before discovery .Returns in the future
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2032 June 18
* 421P/2020 H10
2021 Jan. 25
! 421P/2009 U4
2009 Sept. 9

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