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{{#invoke:Hatnote|hatnote}} {{#invoke:Infobox|infobox}} 128 Nemesis is a large 188 km main-belt asteroid, of carbonaceous composition. It rotates rather slowly, taking about one and half Earth days (39 hours)<ref name=jpldata/> to complete one revolution.<ref name="Scaltriti1979"/> Nemesis is the largest member of the Nemesian asteroid family bearing its name. It was discovered by J. C. Watson on November 25, 1872,<ref name=jpldata/> and named after Nemesis, the goddess of retribution in Greek mythology. Nemesis is also the name of a hypothetical companion star of the Sun.

It is categorized as a C-type asteroid,<ref name="DeMeo2009"/> indicating a primitive carbonaceous composition. Based on IRAS data Nemesis is about 188 km in diameter and is around the 33rd largest main-belt asteroid.<ref name="jpl-search"/> The 39 hour rotation period is the second longest for an asteroid more than 150km in diameter.<ref name="SBDB"/>


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