Ceres Family, Minerva Family, and Interlopers
Until recently, this family was known as the Ceres (Cererean) family or the Minerva (Minervian) family after 1 Ceres (the largest asteroid) or 93 Minerva. However, spectroscopic analyses showed that these largest members were in fact interlopers in their own family, having a different spectral class from the bulk of the members. Other known interlopers are 255 Oppavia, 374 Burgundia, 2507 Bobone, and 2559 Svoboda. This left the fairly minor asteroid 1272 Gefion as the lowest-numbered member.
Read more about this topic: Gefion Family