489P/Denning

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489P/Denning is a Jupiter-family comet with a current orbital period of 9.4 years. It was discovered in 1894 by William F. Denning, however it was lost for 130 years until Maik Meyer identified that the asteroid 2007 HE₄ as the same object as Denning's comet. As of 2025, it is the most recent previously lost comet that was successfully recovered.

Artist's depiction of what the nucleus of comet 489P/Denning may have looked like

The orbits of 489P/Denning from 1800 to 2100, with its current position (as of 2025) marked in green

489P/Denning as seen by Max Wolf on March 1894

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