Late accretion of Ceres-like asteroids and their implantation into the outer main belt

Low-albedo asteroids preserve a record of the primordial solar system planetesimals and conditions in which nebula was active. However, origin evolution these are not well-constrained. Here we measured visible near-infrared (0.5 - 4.0 microns) spectra low-albedo mid-outer main belt. We show that numerous large (d > 100 km) dark (geometric albedo < 0.09) exterior to dwarf planet Ceres' orbit share same spectral features, presumably compositions, as Ceres. also developed thermal model demonstrates Ceres-like have highly-porous interiors, accreted relatively late at 1.5 3.5 Myr after formation calcium-aluminum-rich inclusions, experienced maximum interior temperatures 900 K. localized confined heliocentric region between 3.0 3.4 au but were likely implanted from more distant regions during giant planet's dynamical instability.