Global geologic map of asteroid (101955) Bennu indicates heterogeneous resurfacing in the past 500,000 years
نویسندگان
چکیده
Global geologic maps are useful tools for efficient interpretation of a planetary body, and they provide global context the diversity evolution surface. We used data acquired by OSIRIS-REx spacecraft to create first map near-Earth asteroid (101955) Bennu. As this is small, non-spherical, rubble-pile asteroid, we discuss distinctive mapping challenges best practices that may be future exploration similar asteroids, such as those visited with Hera Janus missions. By on two centimeter-scale image mosaics (2D projected space) shape model (3D space), generated three input respectively describing Bennu's features, surface texture. Based these maps, defined units: Smooth Unit Rugged Unit. The units differentiated primarily basis texture, concentrations boulders, distributions lineaments, mass movement craters. They bounded several scarps. contains abundant boulders signs recent movement. It also has fewer small (<20 m), putatively fresh craters than Unit, suggesting have been erased in former. indicators, infer younger two. Differential crater size-frequency distribution freshest suggest both unit surfaces formed ~10–65 million years ago, when Bennu was located Main Asteroid Belt, not significantly resurfaced past 2 years. Meanwhile, experienced resurfacing within ~500,000 during lifetime asteroid. consistent slope, roughness, normal albedo, thermal emission spectral characteristics. site where mission collected regolith sample nested larger one. So although an older impact-crater setting indicates material sampled recently exposed. Several similarities apparent between (162173) Ryugu from perspective, including distinguishable variations number density well other datasets brightness.
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ژورنال
عنوان ژورنال: Icarus
سال: 2022
ISSN: ['0019-1035', '1090-2643']
DOI: https://doi.org/10.1016/j.icarus.2022.114992