Interlopers
A number of interlopers have been identified, which share the same orbital elements as the true family members, but can not have come from the same breakup because of spectral (hence, compositional) differences. The following have been identified in a spectral survey, and also by inspection of the PDS asteroid taxonomy data set for non-S-type members: 85 Io, 141 Lumen, 546 Herodias, 657 Gunlöd, 1094 Siberia, and 1275 Cimbria.
Read more about this topic: Eunomia Family