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http://hdl.handle.net/20.500.12386/28719
Titolo: | The missing large impact craters on Ceres | Autori: | Marchi, S. Ermakov, A. I. Raymond, C. A. Fu, R. R. O'Brien, D. P. Bland, M. T. Ammannito, E. DE SANCTIS, MARIA CRISTINA Bowling, T. Schenk, P. Scully, J. E. C. Buczkowski, D. L. Williams, D. A. Hiesinger, H. Russell, C. T. |
Data pubblicazione: | 2016 | Rivista: | NATURE COMMUNICATIONS | Numero: | 7 | Fascicolo: | 1 | Da pagina:: | 12257 | Abstract: | 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. | URI: | http://hdl.handle.net/20.500.12386/28719 | URL: | https://www.nature.com/articles/ncomms12257 | ISSN: | 2041-1723 | DOI: | 10.1038/ncomms12257 | Bibcode ADS: | 2016NatCo...712257M | Fulltext: | open |
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