Borovicka J.,Czech Republic Astronomical Institute |
Spurny P.,Czech Republic Astronomical Institute |
Segon D.,Visnjan Science and Education Center |
Andreic Z.,Visnjan Science and Education Center |
And 10 more authors.
Meteoritics and Planetary Science | Year: 2015
The Križevci H6 meteorite was recovered on the basis of fireball data obtained by the cameras of the Croatian Meteor Network. The fireball, which occurred on February 4, 2011, 23:20:40 UT, was also observed by meteor cameras in Slovenia and by the Autonomous Fireball Observatory in Martinsberg, Austria, which belongs to the European Fireball Network. Here, we present detailed data on fireball trajectory, velocity, deceleration, light curve, and orbit. We also modeled the atmospheric fragmentation of the meteoroid on the basis of the light curve and deceleration. The initial mass of the meteoroid was between 25-100kg, most probably about 50kg. Severe fragmentation occurred at heights of approximately 60 and 31km, under dynamic pressures of 0.1 and 3MPa, respectively. The peak absolute magnitude of -13.7 was reached during the second severe fragmentation event. The recovered 291g meteorite was probably the only fragment with a terminal mass exceeding 100g. The orbit had a low inclination of 0.6 degrees, perihelion distance 0.74 AU, and semimajor axis 1.54 AU. Križevci can be ranked among the 10 best documented meteorite falls. © The Meteoritical Society, 2015.
Spurny P.,Academy of Sciences of the Czech Republic |
Borovicka J.,Academy of Sciences of the Czech Republic |
Kac J.,MBK Team |
Kalenda P.,Czech Institute of Rock Structure And Mechanics |
And 5 more authors.
Meteoritics and Planetary Science | Year: 2010
We report an analysis of instrumental observations of a very bright fireball which terminated with a meteorite fall near the town of Jesenice in Slovenia on April 9, 2009, at 0h59m46s UT. The fireball designated EN090409 was recorded photographically and photoelectrically by two southern stations of the Czech part of the European Fireball Network (EN). Simultaneously, a part of the luminous trajectory was also captured by two all-sky CCD systems and one video camera of the Slovenian meteor network. In addition to these optical recordings, the sonic booms produced by the Jesenice fireball were detected at 16 seismic stations located within 150 km of the trajectory. From all these records, we reconstructed the fireball's atmospheric trajectory, basic geophysical data, the possible impact area, and the original heliocentric orbit of the meteoroid. Using a detailed fireball light curve, we modeled the atmospheric fragmentation of the meteoroid. Both the atmospheric behavior and the heliocentric orbit proved to be quite normal in comparison with other observed meteorite falls. The Jesenice orbit is markedly different from the Příbram and Neuschwanstein orbital meteorite pair, which fell on similar dates (April 7, 1959, and April 6, 2002, respectively). Three meteorites with a total weight of 3.6 kg (until April 2010) were found in a high mountain area near the town of Jesenice. They are classified as L6 ordinary chondrites (Bischoff et al. 2010). © The Meteoritical Society, 2010.