تقرير
Craters, Boulders and Regolith of (101955) Bennu Indicative of an Old and Dynamic Surface
| العنوان: | Craters, Boulders and Regolith of (101955) Bennu Indicative of an Old and Dynamic Surface |
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| المؤلفون: | Walsh, K. J, Jawin, E. R, Ballouz, R.-L, Barnouin, O. S, Bierhaus, E. B, Jr, H. C. Connolly, Molaro, J. L, McCoy, T. J, Delbo, M, Hartzell, C. M, Pajola, M, Schwartz, S. R, Trang, D, Asphaug, E, Becker, K. J, Beddingfield, C. B, Bennett, C. A, Bottke, W. F, Burke, K. N, Clark, B. C, Daly, M. G, DellaGiustina, D. N, Dworkin, J. P, Elder, C. M, Golish, D. R, Hildebrand, A. R, Malhotra, R, Marshall, J, Michel, P, Nolan, M. C, Perry, M. E, Rizk, B, Ryan, A, Sandford, S. A, Scheeres, D. J, Susorney, H. C. M, Thuillet, F, Lauretta, D. S |
| المصدر: | Nature Geoscience. 12 |
| بيانات النشر: | United States: NASA Center for Aerospace Information (CASI), 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Space Sciences (General) |
| الوصف: | Small, kilometre-sized near-Earth asteroids are expected to have young and frequently refreshed surfaces for two reasons: collisional disruptions are frequent in the main asteroid belt where they originate, and thermal or tidal processes act on them once they become near-Earth asteroids. Here we present early measurements of numerous large candidate impact craters on near-Earth asteroid (101955) Bennu by the OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security- Regolith Explorer) mission, which indicate a surface that is between 100 million and 1 billion years old, predating Bennu's expected duration as a near-Earth asteroid. We also observe many fractured boulders, the morphology of which suggests an influence of impact or thermal processes over a considerable amount of time since the boulders were exposed at the surface. However, the surface also shows signs of more recent mass movement: clusters of boulders at topographic lows, a deficiency of small craters and infill of large craters. The oldest features likely record events from Bennu's time in the main asteroid belt. |
| نوع الوثيقة: | Report |
| اللغة: | English |
| تدمد: | 1752-0908 1752-0894 |
| DOI: | 10.1038/s41561-019-0326-6 |
| URL الوصول: | https://ntrs.nasa.gov/citations/20190002547 |
| رقم الأكسشن: | edsnas.20190002547 |
| قاعدة البيانات: | NASA Technical Reports |
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Full Text Finder | تدمد: | 17520908 17520894 |
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| DOI: | 10.1038/s41561-019-0326-6 |