The physical properties of meteorites

Ostrowski, D. R.; Bryson, K. L.

doi:10.1016/j.pss.2018.11.003

Cited by 63 publications

(59 citation statements)

References 126 publications

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“…Given porosity and thermal conductivity, the amount of contacts can be estimated, which in turn can be converted to an estimate of tensile strength (see methods). Given the values derived above and assuming a Young's modulus representative for carbonaceous chondrites, tensile strength of the boulder is estimated to be to kPa and thus considerably lower than measurements on meteorite samples , which generally show tensile strengths of the order of one to a few MPa 19 . This low tensile strength indicates an observational bias, namely that any hypothetical meteoroid originating from the boulder observed by MASCOT would likely break up during atmospheric entry and would thus be absent in our meteorite collections.…”

Section: Admissible Thermal Inertia Values Are Shown As a Function Ofmentioning

confidence: 80%

Low thermal conductivity boulder with high porosity identified on C-type asteroid (162173) Ryugu

et al. 2019

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C-type asteroids are among the most pristine objects in the solar system, but little is known about their interior structure and surface properties. Telescopic thermal infrared observations have so far been interpreted in terms of a regolith covered surface with low thermal conductivity and particle sizes in the centimeter range. This includes observations of C-type asteroid (162173) Ryugu, for which average grainsizes of 3-30 mm have been derived 1,2,3. However, upon arrival of the Hayabusa2 spacecraft at Ryugu, a regolith cover

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Section: Admissible Thermal Inertia Values Are Shown As a Function Ofmentioning

confidence: 80%

Low thermal conductivity boulder with high porosity identified on C-type asteroid (162173) Ryugu

et al. 2019

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“…Thermal diffusivities are 0.30-1.09 mm 2 s À1 and 0.05-0.72 mm 2 s À1 for chondrite finds and falls, respectively. It is important to note that Table 2 contains thermal conductivities measured at 200 and 300 K, and that the results are marginally higher (<0.4 W m À1 K À1 ) for ordinary chondrites at 300 K (Ostrowski and Bryson 2019). Calculated average thermal conductivities and porosities for chondrite classes from data in Table 2 representing 300 K and vacuum conditions are presented in Table 3.…”

Section: Resultsmentioning

confidence: 99%

“…Thermal diffusivities and conductivities are very different and scattered even among samples of the same chemical and petrologic type (Figs. and ), which suggests that the physical structure of the stony meteorites strongly affects the thermal conductivity (Ostrowski and Bryson ). This is observed for both falls and finds of H, L, and LL chondrites in this study.…”

Section: Discussionmentioning

confidence: 99%

Thermal and porosity properties of meteorites: A compilation of published data and new measurements

Soini

Kukkonen

Kohout

et al. 2020

Meteorit & Planetary Scien

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We report direct measurements of thermal diffusivity and conductivity at room temperature for 38 meteorite samples of 36 different meteorites including mostly chondrites, and thus almost triple the number of meteorites for which thermal conductivity is directly measured. Additionally, we measured porosity for 34 of these samples. Thermal properties were measured using an optical infrared scanning method on samples of cm‐sizes with a flat, sawn surface. A database compiled from our measurements and literature data suggests that thermal diffusivities and conductivities at room temperature vary largely among samples even of the same petrologic and chemical type and overlap among, for example, different ordinary chondrite classes. Measured conductivities of ordinary chondrites vary from 0.4 to 5.1 W m−1 K−1. On average, enstatite chondrites show much higher values (2.33–5.51 W m−1 K−1) and carbonaceous chondrites lower values (0.5–2.55 W m−1 K−1). Mineral composition (silicates versus iron‐nickel) and porosity control conductivity. Porosity shows (linear) negative correlation with conductivity. Variable conductivity is attributed to heterogeneity in mineral composition and porosity by intra‐ and intergranular voids and cracks, which are important in the scale of typical meteorite samples. The effect of porosity may be even more significant for thermal properties than that of the metal content in chondrites.

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“…Most recently, updated data can be found in Flynn et al. () or Ostrowski and Bryson (), which discuss the strength of meteorites along with other physical properties and contain, in some form (averaged data or data without details), a subset of data provided in this work. Our work focuses solely on strength data (and the experimental conditions under which they were obtained, for example, sample size, strain rate, methodology) and other such related quantities published alongside of them.…”

Section: Introductionmentioning

confidence: 99%

Strengths of meteorites—An overview and analysis of available data

Pohl

Britt

2020

Meteorit & Planetary Scien

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We report all available measurements on strength of meteorites, primarily focusing on compressive and tensile strengths and supplementary data such as Young's modulus, Poisson's ratio, elastic sound wave velocities, density, porosity, and sample sizes. These data are solely taken from the original papers to avoid misprints and other issues. The data are provided as originally presented by the authors with the exception of standardization of units to the SI system. A brief overview of methods for each original work is also provided as a guide to "data quality" since individual papers go to varying levels of detail on their experimental setup and procedures. From this data set, we confirm that the compressive strength of ordinary chondrites (varying in the range of 10s to 100s of MPa) is about an order of magnitude larger compared to their tensile strength and the difference increases with iron content. For carbonaceous chondrites, the tensile strength seems to be about an order of magnitude below the tensile strength of ordinary chondrites and at least an order of magnitude below their compressive strength. We also provide a statistical relation between the strength of meteorites and their densities and porosities and discuss the role of strain rate and sample size on the resultant measured strength. Finally, the data do not provide sufficient statistics to support a size scale effect of strength of meteorites.

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The physical properties of meteorites

Cited by 63 publications

References 126 publications

Low thermal conductivity boulder with high porosity identified on C-type asteroid (162173) Ryugu

Low thermal conductivity boulder with high porosity identified on C-type asteroid (162173) Ryugu

Thermal and porosity properties of meteorites: A compilation of published data and new measurements

Strengths of meteorites—An overview and analysis of available data

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