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The impact and recovery of asteroid 2018 LA
SETI Institute, 189 Bernardo Avenue, Mountain View, California 94043, USA; NASA Ames Research Center, Moffett Field, California 94035, USA .
Botswana Geoscience Institute, Plot 11566, Khama 1 Avenue, Plot 1734, Lobatse, Botswana.
Department of Earth and Planetary Sciences, University of California Davis, One Shields Avenue, Davis, California, 95616 USA.
Botswana International University of Science and Technology, Private Bag 16, Palapye, Botswana.
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2021 (English)In: Meteoritics and Planetary Science, ISSN 1086-9379, E-ISSN 1945-5100, Vol. 56, no 4, p. 844-893Article in journal (Refereed) Published
Abstract [en]

The June 2, 2018 impact of asteroid 2018 LA over Botswana is only the second asteroid detected in space prior to impacting over land. Here, we report on the successful recovery of meteorites. Additional astrometric data refine the approach orbit and define the spin period and shape of the asteroid. Video observations of the fireball constrain the asteroid's position in its orbit and were used to triangulate the location of the fireball's main flare over the Central Kalahari Game Reserve. Twenty‐three meteorites were recovered. A consortium study of eight of these classifies Motopi Pan as an HED polymict breccia derived from howardite, cumulate and basaltic eucrite, and diogenite lithologies. Before impact, 2018 LA was a solid rock of ~156 cm diameter with high bulk density ~2.85 g cm−3, a relatively low albedo pV ~ 0.25, no significant opposition effect on the asteroid brightness, and an impact kinetic energy of ~0.2 kt. The orbit of 2018 LA is consistent with an origin at Vesta (or its Vestoids) and delivery into an Earth‐impacting orbit via the ν6 resonance. The impact that ejected 2018 LA in an orbit toward Earth occurred 22.8 ± 3.8 Ma ago. Zircons record a concordant U‐Pb age of 4563 ± 11 Ma and a consistent 207Pb/206Pb age of 4563 ± 6 Ma. A much younger Pb‐Pb phosphate resetting age of 4234 ± 41 Ma was found. From this impact chronology, we discuss what is the possible source crater of Motopi Pan and the age of Vesta's Veneneia impact basin.

Place, publisher, year, edition, pages
John Wiley & Sons, 2021. Vol. 56, no 4, p. 844-893
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Onboard Space Systems
Identifiers
URN: urn:nbn:se:ltu:diva-83959DOI: 10.1111/maps.13653ISI: 000643151800001PubMedID: 34295141Scopus ID: 2-s2.0-85104768997OAI: oai:DiVA.org:ltu-83959DiVA, id: diva2:1548584
Funder
EU, European Research Council, 610256EU, Horizon 2020, 654208
Note

Validerad;2021;Nivå 2;2021-06-14 (beamah);

Finansiär: Botswana Geoscience Institute; Department of National Museum & Monuments in Botswana; Australian Research Council (LE130100104 ); Academy of Finland (293975, 335595); Institute of Geology of theCzech Academy of Sciences (RVO 67985831); Dutch Research Council (864.14.005); National Natural Science Foundation of China (41403055); Swiss National Science Foundation; National Aeronautics and Space Administration (80NM0018D0004, NNX16AD34G, NNX14-AR92G); Simons Foundation (302497); Goddard Center for Astrobiology; Hayabusa2; SSO (80NSSC18K0854)

Available from: 2021-05-03 Created: 2021-05-03 Last updated: 2024-04-09Bibliographically approved

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Granvik, Mikael

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