An Anomalous Basaltic Meteorite from the Innermost Main Belt

Bland, P. A.; Spurný, Pavel; Towner, M. C.; Bevan, A. W. R.; Singleton, Andrew; Bottke, W. F.; Greenwood, Richard C.; Chesley, Steven R.; Shrbený, L.; Borovička, J.; Ceplecha, Z.; McClafferty, T.; Vaughan, David J.; Benedix, Gretchen; Deacon, Geoff; Howard, K. T.; Franchi, I. A.; Hough, R. M.

doi:10.1126/science.1174787

Cited by 87 publications

(115 citation statements)

References 19 publications

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“…Based on the Bunburra Rockhole meteorite fall observations and sample recovery, Bland et al (2009) suggested that they may be surviving fragments of a differentiated parent body or bodies in the inner main belt different from those that form (4) Vesta. Based on triangulated observations of the fall, Bland et al (2009) determined the pre-entry orbit and estimated a probability of 98% that the observed meteoroid originated in the inner main belt and chances 72% of it originating from the ν 6 resonance (a main contributor to transporting asteroids from the Flora region Nesvornỳ et al 2002;Scholl & Froeschlé 1991). Furthermore, the meteorite oxygen isotopic composition in the recovered meteorites is significantly higher than that of howardite-eucrite-diogenite (HED) meteorites, which are commonly interpreted to be part of the Vesta family.…”

Section: Introductionmentioning

confidence: 99%

Differentiation signatures in the Flora region

Oszkiewicz

Kankiewicz

Wlodarczyk³

et al. 2015

A&A

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Context. Most asteroid families are very homogeneous in physical properties. Some show greater diversity, however. The Flora family is the most intriguing of them. The Flora family is spread widely in the inner main belt, has a rich collisional history, and is one of the most taxonomically diverse regions in the main belt. As a result of its proximity to the asteroid (4) Vesta (the only currently known intact differentiated asteroid) and its family, migration between the two regions is possible. This dynamical path is one of the counter arguments to the hypothesis that there may be traces of a differentiated parent body other than Vesta in the inner main belt region. We here investigate the possibility that some of the V-and A-types (commonly interpreted as basaltoids and dunites -parts of the mantle and crust of differentiated parent bodies) in the Flora dynamical region are not dynamically connected to Vesta. Aims. The goal of this study is to investigate asteroids in the Flora dynamical region that may be witness to the differentiation of a parent body other than (4) Vesta. In particular, we aim at predicting which asteroids may be fragments of a differentiated body or bodies (taxonomical V-types). We also investigate their possible dynamical linkage to the nearby Vesta family. Methods. To predict the taxonomic types of asteroids we used the naive Bayes classifier. We studied their dynamical past through numerical integration including gravitational and Yarkovsky forces. Each asteroid was cloned, and average orbital elements were computed at each step. When possible, we used observationally constrained physical parameters for the thermal forces. Results. Most of the asteroids in the Flora region are predicted to originate from the S-complex (around 47.8%). Tens of asteroids with potentially differential origins are identified in the region, including 164 potential V-types. We investigated the dynamical evolution of selected objects to examine possible linkages of selected asteroids with the nearby Vesta family. In addition to the candidate differentiated objects, we also studied the dynamical evolution of those asteroids from the Flora family for which spectroscopic classification exist. In particular, we used all the physical parameters available for asteroid (809) Lundia to show that the asteroid is unlikely to originate in the Vesta region and that it resided on a stable orbit in the Flora dynamical region for at least 80 My. Its observationally constrained prograde rotation shows that asteroid (809) Lundia is unlikely to be a former Vesta family member. Conclusions. We found that the V-type candidates are plentiful in the Flora dynamical region. Dynamical investigations of selected objects showed that some of these objects were likely not connected to asteroid (4) Vesta and its family for at least 100 My. This adds another piece of evidence to the hypothesis that there are multiple differentiated parent bodies.

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Section: Introductionmentioning

confidence: 99%

Differentiation signatures in the Flora region

Oszkiewicz

Kankiewicz

Wlodarczyk³

et al. 2015

A&A

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“…The Δ 17 O compositions of the three fractions are statistically indistinguishable, with an average value of -0.13 ± 0.04 ‰ (Bland et al, 2009). The oxygen isotopic composition of Bunburra is thus distinct from the HED fractionation line with Δ 17 O =0.24 ± 0.02 ‰.…”

Section: The Bunburra Rockhole Anomalous Basaltic Achondritementioning

confidence: 71%

“…1; Benedix et al, 2010;Bland et al, 2009) with similar modal composition. None of the three fractions of the Bunburra meteorite show significant evidence of intense shock pressures.…”

Section: The Bunburra Rockhole Anomalous Basaltic Achondritementioning

confidence: 95%

“…1) from which three pieces weighing a total of 339 g have been recovered (Bland et al, 2009;Benedix et al, 2010). All three pieces are partially to entirely enclosed by fusion crust created during atmospheric entry on 21 July 2007.…”

Section: The Bunburra Rockhole Anomalous Basaltic Achondritementioning

confidence: 99%

“…The Bunburra Rockhole (hereafter Bunburra) meteorite is a recently recovered anomalous basaltic achondrite for which orbital parameters have been determined: Bunburra's fall was recorded by the Desert Fireball Network in July 2007 (Bland et al, 2009), thus giving this meteorite a unique context relative to other anomalous basaltic achondrites. Here, we report new, exceptionally well-behaved, 40 Ar/ 39 Ar analyses of various fragments of the Bunburra meteorite coupled with argon diffusion models to constrain the thermal and impact history of the Bunburra achondrite.…”

Section: Introductionmentioning

confidence: 99%

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40Ar/39Ar impact ages and time–temperature argon diffusion history of the Bunburra Rockhole anomalous basaltic achondrite

Jourdan

Benedix

Eroğlu³

et al. 2014

Geochimica et Cosmochimica Acta

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V‐type near‐Earth asteroids: Dynamics, close encounters and impacts with terrestrial planets

2017

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Asteroids colliding with planets vary in composition and taxonomical type. Among Near-Earth Asteroids (NEAs) are the V-types, basaltic asteroids that are classified via spectroscopic observations. In this work, we study the probability of Vtype NEAs colliding with Earth, Mars and Venus, as well as the Moon. We perform a correlational analysis of possible craters produced by V-type NEAs. To achieve this, we performed numerical simulations and statistical analysis of close encounters and impacts between V-type NEAs and the terrestrial planets over the next 10 Myr. We find that V-type NEAs can indeed have impacts with all the planets, the Earth in particular, at an average rate of once per ∼ 12 Myr. There are four candidate craters on Earth that were likely caused by V-type NEAs.

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An Anomalous Basaltic Meteorite from the Innermost Main Belt

Cited by 87 publications

References 19 publications

Differentiation signatures in the Flora region

Differentiation signatures in the Flora region

40Ar/39Ar impact ages and time–temperature argon diffusion history of the Bunburra Rockhole anomalous basaltic achondrite

V‐type near‐Earth asteroids: Dynamics, close encounters and impacts with terrestrial planets

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