Shape estimation for Košice, Almahata Sitta and Bassikounou meteoroids

Vinnikov, Vladimir; Gritsevich, Maria; Turchak, L. I.

doi:10.1017/s1743921314013519

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…The southern part of the strewn field was sampled furthest perpendicular to the Farnocchia et al (2017) trajectory, and from those meteorites alone the large masses are spread with FWHM = 3.7 km. Vinnikov et al (2015) found different mass size distributions in each regime.…”

Section: Introductionmentioning

confidence: 92%

Bolide fragmentation: What parts of asteroid 2008 TC₃ survived to the ground?

Jenniskens

Robertson

Goodrich

et al. 2022

Meteorit & Planetary Scien

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Asteroid 2008 TC 3 impacted the Earth's atmosphere with a known shape and orientation. Over 600 meteorites were recovered at recorded locations, including meteorites of nonureilite type. From where in the asteroid did these stones originate? Here, we reconstruct the meteor lightcurve and study the breakup dynamics of asteroid 2008 TC 3 in 3-D hydrodynamic modeling. Two fragmentation regimes are found that explain the lightcurve and strewn field. As long as the asteroid created a wake vacuum, the fragments tended to move into that shadow, where they mixed with small relative velocities and surviving meteorites fell along a narrow strip on the ground. But when the surviving part of the backside and bottom of the asteroid finally collapsed at 33 km altitude, it created an end flare and dust cloud, while fragments were dispersed radially with much higher relative speed due to shock-shock interactions with a distorted shock front. Stones that originated in this final collapse tended to survive in a larger size and fell over a wider area at locations on the ground. Those locations to some extent still trace back to the fragment's original position in the asteroid. We classified the stones from this "large mass" area and used this information to glean some insight into the relative location of recovered ureilites and ordinary and enstatite chondrites in 2008 TC 3 .

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Section: Introductionmentioning

confidence: 92%

Bolide fragmentation: What parts of asteroid 2008 TC₃ survived to the ground?

Jenniskens

Robertson

Goodrich

et al. 2022

Meteorit & Planetary Scien

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“…e loading pressure in front of the body produces the rock fracture when it overcomes its tensile strength. As a natural consequence, meteorite falls often deliver tens to hundreds of stones, just after this type of break-ups [69,70]. We have previously described such behavior when discussing the evolution of Chelyabinsk.…”

Section: Implications For Impact Hazardmentioning

confidence: 98%

A Numerical Approach to Study Ablation of Large Bolides: Application to Chelyabinsk

Trigo-Rodríguez

Dergham

Gritsevich

et al. 2021

Advances in Astronomy

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In this study, we investigate the ablation properties of bolides capable of producing meteorites. The casual dashcam recordings from many locations of the Chelyabinsk superbolide associated with the atmospheric entry of an 18 m in diameter near-Earth object (NEO) have provided an excellent opportunity to reconstruct its atmospheric trajectory, deceleration, and heliocentric orbit. In this study, we focus on the study of the ablation properties of the Chelyabinsk bolide on the basis of its deceleration and fragmentation. We explore whether meteoroids exhibiting abrupt fragmentation can be studied by analyzing segments of the trajectory that do not include a disruption episode. We apply that approach to the lower part of the trajectory of the Chelyabinsk bolide to demonstrate that the obtained parameters are consistent. To do that, we implemented a numerical (Runge–Kutta) method appropriate for deriving the ablation properties of bolides based on observations. The method was successfully tested with the cases previously published in the literature. Our model yields fits that agree with observations reasonably well. It also produces a good fit to the main observed characteristics of Chelyabinsk superbolide and provides its averaged ablation coefficient σ = 0.034 s2 km−2. Our study also explores the main implications for impact hazard, concluding that tens of meters in diameter NEOs encountering the Earth in grazing trajectories and exhibiting low geocentric velocities are penetrating deeper into the atmosphere than previously thought and, as such, are capable of producing meteorites and even damage on the ground.

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“…e same approach, applying the power law distribution with an exponential cutoff, was used in [61][62][63][64] to estimate the shape of original object when considering Košice, Bassikounou, Almahata Sitta, and Sutter's Mill meteorite falls. A curve of the cumulative mass distribution of collected fragments from the Mbale meteorite shower was constructed in [65], and it was shown that a simple power law distribution (straight line in log-log coordinates) fitted the part of this curve for large fragments but could not describe the whole curve.…”

Section: Introductionmentioning

confidence: 99%

On the Mass Distribution of Fragments of an Asteroid Disrupted in the Earth’s Atmosphere

Брыкина

Егорова

2021

Advances in Astronomy

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To model the interaction with the atmosphere of fragments of a disrupted asteroid, which move independently of each other, it is necessary to know their mass distribution. In this regard, an analogy is drawn with fragmentation in high-speed impact experiments performed to simulate the disruption of asteroids at their collisions in outer space. Based on the results of impact experiments and assuming a power law for the mass distribution in a differential form, we obtained the cumulative number of fragments as a function of the fragment mass m normalized to the total mass of fragments, the mass fraction of the largest fragment(s), the number of the largest fragments, and the power index. The formula for the cumulative number of fragments of a disrupted body is used to describe the results of impact experiments for different fragmentation types. The proposed fragment mass distribution is also tested by comparison with the mass distributions of recovered meteorites in the cases of Mbale, Bassikounou, Almahata Sitta, Košice, and Chelyabinsk meteorite falls.

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Shape estimation for Košice, Almahata Sitta and Bassikounou meteoroids

Cited by 6 publications

References 9 publications

Bolide fragmentation: What parts of asteroid 2008 TC₃ survived to the ground?

Bolide fragmentation: What parts of asteroid 2008 TC₃ survived to the ground?

A Numerical Approach to Study Ablation of Large Bolides: Application to Chelyabinsk

On the Mass Distribution of Fragments of an Asteroid Disrupted in the Earth’s Atmosphere

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Shape estimation for Košice, Almahata Sitta and Bassikounou meteoroids

Cited by 6 publications

References 9 publications

Bolide fragmentation: What parts of asteroid 2008 TC3 survived to the ground?

Bolide fragmentation: What parts of asteroid 2008 TC3 survived to the ground?

A Numerical Approach to Study Ablation of Large Bolides: Application to Chelyabinsk

On the Mass Distribution of Fragments of an Asteroid Disrupted in the Earth’s Atmosphere

Contact Info

Product

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Bolide fragmentation: What parts of asteroid 2008 TC₃ survived to the ground?

Bolide fragmentation: What parts of asteroid 2008 TC₃ survived to the ground?