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Evidence for widespread hydrated minerals on asteroid (101955) Bennu

V. Hamilton 1 A. Simon P. Christensen 2 D. Reuter 3 B. Clark 4 M. A. Barucci 5 N. Bowles 6 W. Boynton 7 J. R. Brucato 8 E. Cloutis 9 H. Connolly 10 K. Donaldson Hanna 6 J. Emery 11 H. Enos 7 S. Fornasier 5 C. Haberle 2 R. Hanna 12, 13 E. Howell 7 H. Kaplan 1 L. Keller 14, 15 C. Lantz 16, 17 J.-Y. Li 18 L. Lim 3 T. Mccoy 19 F. Merlin 5 M. Nolan 7 A. Praet 20 B. Rozitis 21 S. Sandford 22 D. Schrader 23 C. Thomas 24 X.-D. Zou 18 D. Lauretta 7 Marc Bernacki 25 Daniel Pino Muñoz 25 
Abstract : Early spectral data from the Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) mission reveal evidence for abundant hydrated minerals on the surface of near-Earth asteroid (101955) Bennu in the form of a near-infrared absorption near 2.7 µm and thermal infrared spectral features that are most similar to those of aqueously altered CM-type carbonaceous chondrites. We observe these spectral features across the surface of Bennu, and there is no evidence of substantial rotational variability at the spatial scales of tens to hundreds of metres observed to date. In the visible and near-infrared (0.4 to 2.4 µm) Bennu’s spectrum appears featureless and with a blue (negative) slope, confirming previous ground-based observations. Bennu may represent a class of objects that could have brought volatiles and organic chemistry to Earth.
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Submitted on : Wednesday, December 18, 2019 - 12:28:55 PM
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V. Hamilton, A. Simon, P. Christensen, D. Reuter, B. Clark, et al.. Evidence for widespread hydrated minerals on asteroid (101955) Bennu. Nature Astronomy, Nature Publishing Group, 2019, 3 (3), pp.332-340. ⟨10.1038/s41550-019-0722-2⟩. ⟨hal-02417653⟩



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