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Latitude Variation of Flux and Impact Angle of Asteroid Collisions with Earth and the Moon
NASA Ames Research Center, Moffett Field, CA, USA.
NASA Goddard Space Flight Center, Greenbelt, MD, USA; The Catholic University of America, Washington D.C., USA.
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology. Department of Physics, University of Helsinki, Helsinki, Finland.ORCID iD: 0000-0002-5624-1888
NASA Ames Research Center, Moffett Field, CA, USA.
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2021 (English)In: The Planetary Science Journal, E-ISSN 2632-3338, Vol. 2, no 3, article id 88Article in journal (Refereed) Published
Abstract [en]

Flux and impact angles were calculated for asteroid collisions with Earth and the Moon, using the latest population models for the distribution of near-Earth objects (NEOs) and precession models to determine the impact probabilities. The calculations predict that the flux of impacts to the poles for Earth is 22% greater than the flux at the equator, and 55% greater for the Moon. Impacts near the equator typically have shallower impact angles with a mode near 30° above the horizontal. Conversely, impacts near the poles are typically steep with a mode close to 65°. Our new analysis updates the previously published results by Le Feuvre & Wieczorek incorporating: (1) an updated debiased distribution of NEOs, and (2) updated collision probabilities that account for Lidov–Kozai precession. The new impact distributions provide an important update to risk models, showing a 7% increase in average population risks from sub-300 m impactors, compared to previous atmospheric entry distributions, mostly due to faster impact velocities.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2021. Vol. 2, no 3, article id 88
Keywords [en]
Near-Earth objects, Impact phenomena, Meteor radiants, Lunar craters, Lunar impacts
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Onboard space systems
Identifiers
URN: urn:nbn:se:ltu:diva-86567DOI: 10.3847/PSJ/abefdaISI: 000912987600001Scopus ID: 2-s2.0-85108859639OAI: oai:DiVA.org:ltu-86567DiVA, id: diva2:1584457
Funder
Knut and Alice Wallenberg Foundation
Note

Godkänd;2021;Nivå 0;2021-08-12 (alebob);

Forskningsfinansiär: NASA (80GSFC17M0002; 80GSFC21M0002); Grant Agency of the Czech Republic (20-10907S); Academy of Finland;

A correction is available for this publication, please see: Robertson, D., Ozerov, A., Wheeler, L.  et al. Erratum: "Latitude Variation of Flux and Impact Angle of Asteroid Collisions with Earth and the Moon" (2021, PSJ, 2, 88). Planet, Sci. J. 4, 19 (2023). https://doi.org/10.3847/PSJ/aca1a7

Available from: 2021-08-12 Created: 2021-08-12 Last updated: 2023-03-13Bibliographically approved

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Granvik, Mikael

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