Browsing by Subject "H CHONDRITE"

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  • Gritsevich, Maria; Vinnikov, Vladimir; Kohout, Tomas; Toth, Juraj; Peltoniemi, Jouni; Turchak, Leonid; Virtanen, Jenni (2014)
    Abstract–In this study, we conduct a detailed analysis of the Košice meteorite fall (February28, 2010), to derive a reliable law describing the mass distribution among the recovered fragments. In total, 218 fragments of the Košice meteorite, with a total mass of 11.285 kg, were analyzed. Bimodal Weibull, bimodal Grady, and bimodal lognormal distributions are found to be the most appropriate for describing the Košice fragmentation process. Based on the assumption of bimodal lognormal, bimodal Grady, bimodal sequential, and bimodal Weibull fragmentation distributions, we suggest that, prior to further extensive fragmentation in the lower atmosphere, the Košice meteoroid was initially represented by two independent pieces with cumulative residual masses of approximately 2 and 9 kg, respectively. The smaller piece produced about 2 kg of multiple lightweight meteorite fragments with the mean around 12 g. The larger one resulted in 9 kg of meteorite fragments, recovered on the ground, including the two heaviest pieces of 2.374 kg and 2.167 kg with the mean around 140 g. Based on our investigations, we conclude that two to three larger fragments of 500–1000 g each should exist, but were either not recovered or not reported by illegal meteorite hunters.
  • Kohout, Tomas; Havrila, Karol; Toth, Juraj; Husarik, Marek; Gritsevich, Maria; Britt, Daniel; Borovicka, Jiri; Spurny, Pavel; Igaz, Antal; Svoren, Jan; Kornos, Leonard; Veres, Peter; Koza, Julius; Zigo, Pavol; Gajdos, Stefan; Vilagi, Jozef; Capek, David; Krisandova, Zuzana; Tomko, Dusan; Silha, Jiri; Schunova, Eva; Bodnarova, Marcela; Buzova, Diana; Krejcova, Tereza (2014)
    Bulk and grain density, porosity, and magnetic susceptibility of 67 individuals of Košice H chondrite fall were measured. The mean bulk and grain densities were determined to be 3.43 g/cm3 with standard deviation (s.d.) of 0.11 g/cm3 and 3.79 g/cm3 with s.d. 0.07 g/cm3, respectively. Porosity is in the range from 4.2 to 16.1%. The logarithm of the apparent magnetic susceptibility (in 10−9 m3/kg) shows narrow distribution from 5.17 to 5.49 with mean value at 5.35 with s.d. 0.08. These results indicate that all studied Košice meteorites are of the same composition down to ∼g scale without presence of foreign (non-H) clasts and are similar to other H chondrites. Košice is thus a homogeneous meteorite fall derived from a homogenous meteoroid.