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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.

Segon D.,Astronomical Society Istra Pula | Segon D.,Visnjan Science and Education Center | Andreic Z.,University of Zagreb | Gural P.S.,351 Samantha Drive | And 6 more authors.
Earth, Moon and Planets | Year: 2014

The predicted Draconid meteor shower outburst during October 2011 had been observed by a portion of the Croatian Meteor Network whose stations encountered clear weather. A total of 95 Draconid orbits have been calculated from 18 contributing stations, and in this paper we present results for 63 orbits obtained from the fully automatic observation and processing pipeline. Two methods of trajectory estimation were applied, showing better fit results using a linearly changing velocity model versus a constant velocity model. The estimated mean radiant position has been found to be at RA = 262.6°, Dec = +55.7°, with estimated geocentric velocity Vg = 20.7 km/s. © 2014 Springer Science+Business Media Dordrecht.

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