Latitude Variation of Flux and Impact Angle of Asteroid Collisions with Earth and the MoonShow others and affiliations
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
2021-08-122021-08-122023-03-13Bibliographically approved