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Título: | Dust environment of active asteroids P/2019 A4 (PANSTARRS) and P/2021 A5 (PANSTARRS) |
Autor: | Moreno, Fernando CSIC ORCID; Licandro, Javier; Cabrera-Lavers, Antonio; Morate, David; Guirado, D. | Palabras clave: | Minor planets Asteroids: individual: P/2019 A4P/2021 A5 |
Fecha de publicación: | sep-2021 | Editor: | Oxford University Press | Citación: | Monthly Notices of the Royal Astronomical Society 506(2): 1733-1740 (2021) | Resumen: | We report on the characterization of the dust activity and dynamical evolution of two faint active asteroids, P/2019 A4, and P/2021 A5, observed with the 10.4 m GTC using both imaging and spectroscopy. Asteroid P/2019 A4 activity is found to be linked to an impulsive event occurring some ±10 d around perihelion, probably due to a collision or a rotational disruption. Its orbit is stable over 100 Myr time-scales. Dust tail models reveal a short-term burst producing (2.0 ± 0.7) × 106 kg of dust for maximum particle radius rmax = 1 cm. The spectrum of P/2019 A4 is featureless, and slightly redder than the Sun. P/2021 A5 was active ~50 d after perihelion, lasting ~5 to ~60 d, and ejecting (8 ± 2) × 106 kg of dust for rmax = 1 cm. The orbital simulations show that a few percent of dynamical clones of P/2021 A5 are unstable on 20-50 Myr time-scales. Thus, P/2021 A5 might be an implanted object from the JFC region or beyond. These facts point to water-ice sublimation as the activation mechanism. This object also displays a featureless spectrum, but slightly bluer than the Sun. Nuclei sizes are estimated in the few hundred meters range for both asteroids. Particle ejection speeds (≈0.2 m s-1) are consistent with escape speeds from those small-sized objects. © 2021 The Author(s) 2021. Published by Oxford University Press on behalf of Royal Astronomical Society. | Descripción: | This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. | Versión del editor: | http://dx.doi.org/10.1093/mnras/stab1841 | URI: | http://hdl.handle.net/10261/256340 | DOI: | 10.1093/mnras/stab1841 | ISSN: | 0035-8711 | E-ISSN: | 1365-2966 |
Aparece en las colecciones: | (IAA) Artículos |
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2021MNRAS.506.1733M.pdf | 1,99 MB | Adobe PDF | Visualizar/Abrir |
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