42P/Neujmin, also known as Neujmin 3, is a periodic comet 2 km in diameter. It will next came to perihelion on 14 January 2026 at around magnitude 19.

This comet and 53P/Van Biesbroeck are fragments of a parent comet that split in March 1845.

The comet did not come within 1 AU of a planet in the 20th century, but will pass 0.04 AU from asteroid 4 Vesta on July 17, 2036.

The comet nucleus is estimated to be 2.2 kilometers in diameter.

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Numbered comets
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