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Minimum perihelion distances and associated dwell times for near-Earth asteroids
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.ORCID iD: 0000-0002-2413-4172
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology. Department of Physics, University of Helsinki, PO Box 64, FI-00014 Helsinki, Finland.ORCID iD: 0000-0002-5624-1888
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.ORCID iD: 0000-0002-3783-2279
2021 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 506, no 3, p. 3301-3312Article in journal (Refereed) Published
Abstract [en]

The observed near-Earth asteroid (NEA) population contains very few objects with small perihelion distances, say, q≲0.2au⁠. NEAs that currently have orbits with larger q might be hiding a past evolution during which they have approached closer to the Sun. We present a probabilistic assessment of the minimum q that an asteroid has reached during its orbital history. At the same time, we offer an estimate of the dwell time, that is, the time q has been in a specific range. We have re-analysed orbital integrations of test asteroids from the moment they enter the near-Earth region until they either collide with a major body or are thrown out from the inner Solar system. We considered a total disruption of asteroids at certain q as a function of absolute magnitude (H). We calculated the probability that an asteroid with given orbital elements and H has reached a q smaller than a given threshold value and its respective dwell time in that range. We have constructed a look-up table that can be used to study the past orbital and thermal evolution of asteroids as well as meteorite falls and their possible parent bodies. An application to 25 meteorite falls shows that carbonaceous chondrites typically have short dwell times at small q, whereas for ordinary chondrites it ranges from 10000 to 500000 yr. A dearth of meteorite falls with long dwell times and small minimum q supports a supercatastrophic disruption of asteroids at small q.

Place, publisher, year, edition, pages
Oxford University Press, 2021. Vol. 506, no 3, p. 3301-3312
Keywords [en]
meteorites, meteors, meteoroids, minor planets, asteroids: general, software: simulations
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Onboard space systems
Identifiers
URN: urn:nbn:se:ltu:diva-86566DOI: 10.1093/mnras/stab1934ISI: 000685245200013Scopus ID: 2-s2.0-85112390561OAI: oai:DiVA.org:ltu-86566DiVA, id: diva2:1584448
Funder
Knut and Alice Wallenberg Foundation
Note

Validerad;2021;Nivå 2;2021-08-12 (alebob)

Available from: 2021-08-12 Created: 2021-08-12 Last updated: 2023-09-04Bibliographically approved

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Toliou, AthanasiaGranvik, MikaelTsirvoulis, Georgios

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