Density, porosity and magnetic susceptibility of the Košice meteorite shower and homogeneity of its parent meteoroid

Kohout, T.; Havrila, Karol; Tóth, Juraj; Husárik, M.; Gritsevich, Maria; Britt, D. T.; Borovička, J.; Spurný, Pavel; Igaz, Antal; Svoreň, J.; Kornoš, Leonard; Vereš, Peter; Koza, J.; Zigo, P.; Gajdoš, Š.; Világi, Jozef; Čapek, D.; Krišandová, Zuzana Seman; Tomko, D.; Šilha, Jiří; Schunová, E.; Bodnárová, M.; Búzová, Diana; Krejčová, Tereza

doi:10.1016/j.pss.2014.02.003

Cited by 19 publications

(13 citation statements)

References 26 publications

(41 reference statements)

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“…The density of samples (measured using a method of small glass beds) varied between 3.22 and 3.88 g cm −3 ; the average density was 3.51 g cm −3 (Table ), comparable with the value of 3.43 g cm −3 estimated for the Košice meteorite by Kohout et al. (), which is also in agreement with average value for H chondrites (3.42 g cm −3 ) reported by Consolmagno et al. ().…”

Section: Samples and Methodssupporting

confidence: 90%

Cosmogenic nuclides in the Košice meteorite: Experimental investigations and Monte Carlo simulations

Povinec

Masarik

Sýkora

et al. 2015

Meteorit & Planetary Scien

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Results of nondestructive gamma-ray analyses of cosmogenic radionuclides ( 7 Be, 22 Na, 26 Al, 46 Sc, 48 V, 54 Mn, 56 Co, 57 Co, 58 Co, and 60 Co) in 19 fragments of the Ko sice meteorite are presented and discussed. The activities varied mainly with position of fragments in the meteoroid body, and with fluxes of cosmic-ray particles in the space affecting radionuclides with different half-lives. Monte Carlo simulations of the production rates of 60 Co and 26 Al compared with experimental data indicate that the pre-atmospheric radius of the meteoroid was 50 AE 5 cm. In two Ko sice fragments, He, Ne, and Ar concentrations and isotopic compositions were also analyzed. The noble-gas cosmic-ray exposure age of the Ko sice meteorite is 5-7 Myr, consistent with the conspicuous peak (or doublet peak) in the exposure age histogram of H chondrites. One sample likely contains traces of implanted solar wind Ne, suggesting that Ko sice is a regolith breccia. The agreement between the simulated and observed 26 Al activities indicate that the meteoroid was mostly irradiated by a long-term average flux of galactic cosmic rays of 4.8 particles cm À2 s À1 , whereas the short-lived radionuclide activities are more consistent with a flux of 7.0 protons cm À2 s À1 as a result of the low solar modulation of the galactic cosmic rays during the last few years before the meteorite fall.

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Section: Samples and Methodssupporting

confidence: 90%

Cosmogenic nuclides in the Košice meteorite: Experimental investigations and Monte Carlo simulations

Povinec

Masarik

Sýkora

et al. 2015

Meteorit & Planetary Scien

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“…The mean value of the logarithm of the apparent magnetic susceptibilities was 5.35 ± 0.08 × 10 −9 Am 2 kg −1 (Kohout et al. ), which was consistent with other ordinary chondrites.…”

Section: Meteorite Propertiessupporting

confidence: 80%

“…) led to a possible conclusion that the original meteoroid was composed from two main different components, which should be the same meteorite type (H ordinary chondrite, Kohout et al. ), but different in physical properties leading to different mass distribution of fragments. This is very well represented by the strewn field distribution of fragments, as well as by fragmentation processes in the atmosphere.…”

Section: Meteorite Propertiesmentioning

confidence: 99%

The Košice meteorite fall: Recovery and strewn field

Tóth

Svoreň

Borovička

et al. 2015

Meteorit & Planetary Scien

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We provide the circumstances and details of the fireball observation, search expeditions, recovery, strewn field, and physical characteristics of the Ko sice meteorite that fell in Slovakia on February 28, 2010. The meteorite was only the 15th case of an observed bolide with a recovered mass and subsequent orbit determination. Despite multiple eyewitness reports of the bolide, only three videos from security cameras in Hungary were used for the strewn field determination and orbit computation. Multiple expeditions of professionals and individual searchers found 218 fragments with total weight of 11.3 kg. The strewn field with the size of 5 9 3 km is characterized with respect to the space distribution of the fragments, their mass and size-frequency distribution. This work describes a catalog of 78 fragments, mass, size, volume, fusion crust, names of discoverers, geographic location, and time of discovery, which represents the most complex study of a fresh meteorite fall. From the analytical results, we classified the Ko sice meteorite as an ordinary H5 chondrite. 853

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“…Entry parameters of four superbolides compared in this study. Photometric mass estimate; bKohout et al (2014); cBritt and Consolmagno (2003); dSosa and Fernández (2009) …”

mentioning

confidence: 99%

The January 7, 2015, superbolide over Romania and structural diversity of meter-sized asteroids

Borovička

Spurný

Grigore

et al. 2017

Planetary and Space Science

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Superbolides, i.e. extremely bright meteors produced by entries of meter-sized bodies into terrestrial atmosphere, are rare events. We present here detailed analysis of a superbolide, which occurred over Romania on January 7, 2015. The trajectory, velocity, and orbit were determined using two all-sky photographs from a station of the European Fireball Network (EN) in Slovakia and five casual video records from Romania, which were carefully calibrated. Bolide light curve was measured by EN radiometers. We found that the entry speed was 27.76 ± 0.19 km s −1 , significantly lower than reported by US Government sensors. The orbit was asteroidal with low inclination and aphelion inside Jupiter's orbit. The atmospheric behavior was, however, not typical for an asteroidal body. The peak brightness of absolute magnitude of −21 was reached at a quite large height of 42.8 km and the brightness then decreased quickly. The bolide almost disappeared at a height of 38.7 km, leaving just a stationary luminous trail visible for several seconds. Only one small fragment continued until the height of 36 km. Brief meteorite searches were unsuccessful. The modeling of the light curve revealed that the body of initial mass of about 4500 kg remained almost intact until the dynamic pressure reached 0.9 MPa but it was then quickly disintegrated into many tiny fragments and dust under 1-3 MPa. A comparison was made with three other superbolides for which we have radiometric light curves: ordinary chondrite fall Košice, carbonaceous chondrite fall Maribo, and cometary Taurid bolide of October 31, 2015. The Romanian superbolide was not similar to any of these and represents probably a new type of material with intrinsic strength of about 1 MPa.

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Density, porosity and magnetic susceptibility of the Košice meteorite shower and homogeneity of its parent meteoroid

Cited by 19 publications

References 26 publications

Cosmogenic nuclides in the Košice meteorite: Experimental investigations and Monte Carlo simulations

Cosmogenic nuclides in the Košice meteorite: Experimental investigations and Monte Carlo simulations

The Košice meteorite fall: Recovery and strewn field

The January 7, 2015, superbolide over Romania and structural diversity of meter-sized asteroids

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