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The impact and recovery of asteroid 2018 LA.
Meteorit. Planet. Sci. 56, 844-893 (2021)
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 , a relatively low albedo p ~ 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 ν 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 Pb/ Pb 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. −3 207 206 V 6
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Asteroid 2018 La ; Howardites ; Motopi Pan ; Vesta; Ray Exposure Ages; 4 Vesta; Hed Meteorites; Noble-gases; Natural Thermoluminescence; Collisional History; Stony Meteorites; Constraints; Regolith; Eucrite
ISSN (print) / ISBN
1086-9379
e-ISSN
1945-5100
Journal
Meteoritics & Planetary Science
Quellenangaben
Volume: 56,
Issue: 4,
Pages: 844-893
Publisher
University of Arizona, Department of Geosciences
Publishing Place
111 River St, Hoboken 07030-5774, Nj Usa
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Research Unit BioGeoChemistry and Analytics (BGC)
Grants
NASA SSO program
European Research Council (FP7) ERC-2013-SyG
Swiss National Science Foundation
National Natural Science Foundation of China
Dutch Research Council (NWO VIDI project)
Institute of Geology of the Czech Academy of Sciences
Academy of Finland
ARC LIEF grant from the Australian Research Council
Department of National Museum & Monuments in Botswana
Europlanet
European Union's Horizon 2020 research and innovation programme
National Aeronautics and Space Administration
NASA NEOO program
Hayabusa2 Program
NASA Emerging Worlds Program
NASA Goddard Center for Astrobiology
NASA Astrobiology Institute
Simons Foundation (SCOL award)
NASA SSERVI Center for Asteroid and Lunar Surface Science (CLASS)
NASA's Planetary Defense Coordination Office
NASA
Botswana Geoscience Institute
European Research Council (FP7) ERC-2013-SyG
Swiss National Science Foundation
National Natural Science Foundation of China
Dutch Research Council (NWO VIDI project)
Institute of Geology of the Czech Academy of Sciences
Academy of Finland
ARC LIEF grant from the Australian Research Council
Department of National Museum & Monuments in Botswana
Europlanet
European Union's Horizon 2020 research and innovation programme
National Aeronautics and Space Administration
NASA NEOO program
Hayabusa2 Program
NASA Emerging Worlds Program
NASA Goddard Center for Astrobiology
NASA Astrobiology Institute
Simons Foundation (SCOL award)
NASA SSERVI Center for Asteroid and Lunar Surface Science (CLASS)
NASA's Planetary Defense Coordination Office
NASA
Botswana Geoscience Institute