2016/07/26 by S. Marchi, A. Ermakov, C. A. Raymond +12 · 1 citation
Physics and Astronomy · Earth and Planetary Sciences · #Astro and Planetary Science #Planetary Science and Exploration #Geology and Paleoclimatology Research
paper · pdf · doi:10.1038/ncomms12257
openalex publication_date 2016/07/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/02
Asteroids provide fundamental clues to the formation and evolution of planetesimals. Collisional models based on the depletion of the primordial main belt of asteroids predict 10-15 craters >400 km should have formed on Ceres, the largest object between Mars and Jupiter, over the last 4.55 Gyr. Likewise, an extrapolation from the asteroid Vesta would require at least 6-7 such basins. However, Ceres' surface appears devoid of impact craters >∼280 km. Here, we show a significant depletion of cerean craters down to 100-150 km in diameter. The overall scarcity of recognizable large craters is incompatible with collisional models, even in the case of a late implantation of Ceres in the main belt, a possibility raised by the presence of ammoniated phyllosilicates. Our results indicate that a significant population of large craters has been obliterated, implying that long-wavelength topography viscously relaxed or that Ceres experienced protracted widespread resurfacing.