The instrumentally recorded fall of the Križevci meteorite, Croatia, February 4, 2011

Abstract

The Kri zevci 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 25-100 kg, most probably about 50 kg. Severe fragmentation occurred at heights of approximately 60 and 31 km, under dynamic pressures of 0.1 and 3 MPa, respectively. The peak absolute magnitude of À13.7 was reached during the second severe fragmentation event. The recovered 291 g meteorite was probably the only fragment with a terminal mass exceeding 100 g. The orbit had a low inclination of 0.6 degrees, perihelion distance 0.74 AU, and semimajor axis 1.54 AU. Kri zevci can be ranked among the 10 best documented meteorite falls.

The Žďár nad Sázavou meteorite fall: Fireball trajectory, photometry, dynamics, fragmentation, orbit, and meteorite recovery

“…These fragments, nevertheless, had much higher strengths and fragmented at lower heights under larger pressures. The largest remaining fragment survived intact maximum pressure of 2.7 MPa, which is comparable with similar cases as Ko sice (Borovi cka et al 2013a) or Kri zevci (Borovi cka et al 2015a).…”

“…2013b) and H6 chondrite Križevci (Borovička et al. 2015a). The mass of the largest surviving fragment is plotted as a function of increasing dynamic pressure.…”

“…The dynamic pressure is computed as p = qv 2 , where q is atmospheric density and v is meteoroid velocity. Figure 18 presents a comparison in this respect of Zd' ar nad S azavou with two other ordinary chondrite meteorite falls, H5 chondrite Ko sice (Borovi cka et al 2013b) and H6 chondrite Kri zevci (Borovi cka et al 2015a). The mass of the largest surviving fragment is plotted as a function of increasing dynamic pressure.…”

Park Forest (L5) and the asteroidal source of shocked L chondrites

“…), the Croatian Fireball Network (Borovička et al. ), the French Fireball Network (Colas et al. ), and the Finnish Fireball Network (e.g., Dmitriev et al.…”

“…However, in terms of numbers of recovered meteorites, a more important factor is the constant progress in the installation of dedicated fireball camera networks by academics and amateurs. Examples of such efforts are the European Fireball Network (e.g., Oberst et al 1998), the Spanish Fireball Network (e.g., Trigo-Rodr ıguez et al 2006), the Polish Fireball Network (e.g., _ Zoła̧dek et al 2007), the Desert Fireball Network in the Nullarbor region of Australia (e.g., Bland et al 2009), the CAMS network in California (e.g., Jenniskens et al 2014), the Croatian Fireball Network (Borovi cka et al 2015), the French Fireball Network (Colas et al 2015), and the Finnish Fireball Network (e.g., Dmitriev et al 2015).…”