128P/Shoemaker–Holt, also known as Shoemaker-Holt 1, is a periodic comet in the Solar System. The comet passed close to Jupiter in 1982 and was discovered in 1987. The comet was last observed in March 2018. The nucleus was split into two pieces (A+B) during the 1997 apparition. Fragment A was last observed in 1996 and only has a 79-day observation arc. Fragment B is estimated to be 4.6 km in diameter.