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Journal Articles Meteoritics & Planetary Science Year : 2021

The impact and recovery of asteroid 2018 LA

Peter Jenniskens
  • Function : Author
Mohutsiwa Gabadirwe
  • Function : Author
Qing-Zhu Yin
Alexander Proyer
  • Function : Author
Oliver Moses
  • Function : Author
Tomas Kohout
  • Function : Author
Fulvio Franchi
  • Function : Author
Roger L. Gibson
  • Function : Author
Richard Kowalski
  • Function : Author
Eric J. Christensen
  • Function : Author
Alex R. Gibbs
  • Function : Author
Aren Heinze
  • Function : Author
Larry Denneau
  • Function : Author
Davide Farnocchia
Paul W. Chodas
  • Function : Author
William Gray
  • Function : Author
Marco Micheli
Nick Moskovitz
  • Function : Author
Christopher A. Onken
  • Function : Author
Christian Wolf
Hadrien A. R. Devillepoix
  • Function : Author
Quanzhi Ye
  • Function : Author
Darrel K. Robertson
  • Function : Author
Peter Brown
Esko Lyytinen
  • Function : Author
Jarmo Moilanen
  • Function : Author
Jim Albers
  • Function : Author
Tim Cooper
  • Function : Author
Jelle Assink
  • Function : Author
Läslo Evers
  • Function : Author
Panu Lahtinen
  • Function : Author
Lesedi Seitshiro
  • Function : Author
Matthias Laubenstein
  • Function : Author
Nggie Wantlo
  • Function : Author
Phemo Moleje
  • Function : Author
Joseph Maritinkole
  • Function : Author
Heikki Suhonen
  • Function : Author
Michael E. Zolensky
  • Function : Author
Lewis Ashwal
  • Function : Author
Takahiro Hiroi
  • Function : Author
Derek W. Sears
  • Function : Author
Alexander Sehlke
  • Function : Author
Alessandro Maturilli
  • Function : Author
Matthew E. Sanborn
  • Function : Author
Magdalena H. Huyskens
  • Function : Author
Supratim Dey
  • Function : Author
Karen Ziegler
  • Function : Author
Henner Busemann
  • Function : Author
My E. I. Riebe
  • Function : Author
Matthias M. M. Meier
  • Function : Author
Kees C. Welten
  • Function : Author
Marc W. Caffee
  • Function : Author
Qin Zhou
  • Function : Author
Qiu-Li Li
  • Function : Author
Xian-Hua Li
  • Function : Author
Yu Liu
Guo-Qiang Tang
  • Function : Author
Hannah L. Mclain
  • Function : Author
Jason P. Dworkin
  • Function : Author
Daniel P. Glavin
  • Function : Author
Philippe Schmitt-Kopplin
Mikael Granvik
  • Function : Author
Babutsi Mosarwa
  • Function : Author
Koketso Botepe
  • Function : Author

Abstract

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.

Dates and versions

insu-03672441 , version 1 (19-05-2022)

Identifiers

Cite

Peter Jenniskens, Mohutsiwa Gabadirwe, Qing-Zhu Yin, Alexander Proyer, Oliver Moses, et al.. The impact and recovery of asteroid 2018 LA. Meteoritics & Planetary Science, 2021, 56, pp.844-893. ⟨10.1111/maps.13653⟩. ⟨insu-03672441⟩
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