Lifted particles from the fast spinning primary of the Near-Earth Asteroid (65803) Didymos
| Autor: | Nair Trógolo, Adriano Campo Bagatin, Fernando Moreno, Paula G. Benavidez |
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| Přispěvatelé: | Ministerio de Ciencia e Innovación (España), Junta de Andalucía, European Commission, Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina), Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Universidad de Alicante. Instituto Universitario de Física Aplicada a las Ciencias y las Tecnologías |
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: |
Earth and Planetary Astrophysics (astro-ph.EP)
Dynamics – Asteroids AsteroidsDynamics Space and Planetary Science FOS: Physical sciences Rotation – Near-Earth objects – Regoliths Astronomy and Astrophysics Regoliths Near-Earth objects Asteroids Asteroids – Asteroids AsteroidsRotation Astrophysics - Earth and Planetary Astrophysics |
| Popis: | This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) An increasing number of Near Earth Asteroids (NEAs) in the range of a few hundred metres to a few kilometres in size have relatively high spin rates, from less than 4 h, down to 2.2 h, depending on spectral type. For some of these bodies, local acceleration near the equator may be directed outwards so that lift off of near-equatorial material is possible. In particular, this may be the case for asteroid Didymos, the primary of the (65803) Didymos binary system, which is the target of the DART (NASA) and Hera (ESA) space missions. The study of the dynamics of particles in such an environment has been carried out – in the frame of the Hera mission and the EC-H2020 NEO-MAPP project – according to the available shape model, known physical parameters and orbital information available before the DART impact. The presence of orbiting particles in the system is likely for most of the estimated range of values for mass and volume. The spatial mass density of ejected material is calculated for different particle sizes and at different heliocentric orbit epochs, revealing that large particles dominate the mass density distribution and that small particle abundance depends on observation epoch. Estimates of take off and landing areas on Didymos are also reported. Available estimates of the system mass and primary extents, after the DART mission, confirm that the main conclusions of this study are valid in the context of current knowledge. © 2023 The Authors. Published by Elsevier Inc. NT, ACB and PBL acknowledge funding by the NEO-MAPP project through grant agreement 870377, in the frame of the EC H2020-SPACE-2019. NT acknowledges funding by CONICET (Argentina). ACB and PBL acknowledge funding by MCIN/AEI (Spain) RTI2018-099464-B-I00. FM acknowledges funding by MCIN/AEI (Spain) PID2021-123370OB-I00, by Junta de Andalucia (Spain) European Union NextGeneratioEU/PTR P18-RT-1854, and by MCIN/AEI (Spain) CEX2021-001131-S. |
| Databáze: | OpenAIRE |
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