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Marsset, M., Brož, M., Vernazza, P., Drouard, A., Castillo-Rogez, J., Hanuš, J., … Yang, B. (2020, February 10). The violent collisional history of aqueously evolved (2) Pallas. Nature Astronomy. Springer Science and Business Media LLC. http://doi.org/10.1038/s41550-019-1007-5 |
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| Título: | The violent collisional history of aqueously evolved (2) Pallas |
Autor: | Marsset, M.; Santana Rojas, Felipe Antonio | Financiadores: | European Commission NASA Generalitat Valenciana |
Fecha de publicación: | 2020 | Editor: | Springer Nature | Citación: | Nature Astronomy 4: 569–576 (2020) | Resumen: | Asteroid (2) Pallas is the largest main-belt object not yet visited by a spacecraft, making its surface geology largely unknown and limiting our understanding of its origin and collisional evolution. Previous ground-based observational campaigns returned different estimates of its bulk density that are inconsistent with one another, one measurement1 being compatible within error bars with the icy Ceres (2.16 ± 0.01 g cm−3)2 and the other3 compatible within error bars with the rocky Vesta (3.46 ± 0.03 g cm−3)4. Here we report high-angular-resolution observations of Pallas performed with the extreme adaptive optics-fed SPHERE imager5 on the Very Large Telescope. Pallas records a violent collisional history, with numerous craters larger than 30 km in diameter populating its surface and two large impact basins that could be related to a family-forming impact. Monte Carlo simulations of the collisional evolution of the main belt correlate this cratering record to the high average impact velocity of ~11.5 km s−1 on Pallas—compared with an average of ~5.8 km s−1 for the asteroid belt—induced by Pallas’s high orbital inclination (i = 34.8°) and orbital eccentricity (e = 0.23). Compositionally, Pallas’s derived bulk density of 2.89 ± 0.08 g cm−3 (1σ uncertainty) is fully compatible with a CM chondrite-like body, as suggested by its spectral reflectance in the 3 μm wavelength region6. A bright spot observed on its surface may indicate an enrichment in salts during an early phase of aqueous alteration, compatible with Pallas’s relatively high albedo of 12–17% (refs. 7,8), although alternative origins are conceivable. | Descripción: | et al. | Versión del editor: | https://doi.org/10.1038/s41550-019-1007-5 | URI: | http://hdl.handle.net/10261/237549 | DOI: | 10.1038/s41550-019-1007-5 | E-ISSN: | 2397-3366 |
| Aparece en las colecciones: | (ICE) Artículos |
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| violenPalla.pdf | 3,56 MB | Adobe PDF |  Visualizar/Abrir |
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