Meteoritics & Planetary Science 50, Nr 7, 1244–1259 (2015)
doi: 10.1111/maps.12469
The instrumentally recorded fall of the Križevci meteorite,
Croatia, February 4, 2011
J. BOROVIČKA1, P. SPURNÝ1,
D.
ŠEGON2,3, Ž. ANDREIĆ2,4, J. KAC5,
K. KORLEVIĆ2, J. ATANACKOV5,6, G. KLADNIK5,7,
H.
MUCKE8, D. VIDA2,9, and F. NOVOSELNIK2,9
1Astronomical Institute of the
Czech Academy of Sciences, CZ-25165, Ondřejov, Czech Republic
2Višnjan Science and Education Center, Istarska 5, 51463
Višnjan,
Croatia
3Astronomical Society Istra Pula, Park Monte Zaro 2, 52100
Pula, Croatia
4Faculty of Mining, Geology, and Petroleum Engineering,
University of
Zagreb, Pijerottijeva 6, 10000 Zagreb, Croatia
5MBK Team, Orion Astronomical Society, SI-2000 Maribor,
Slovenia
6Geological Survey of Slovenia, SI-1000 Ljubljana, Slovenia
7Faculty of Mathematics and Physics, University of
Ljubljana, SI-1000
Ljubljana, Slovenia
8Astronomisches Büro, Hasenwartgasse 32, A-1230 Wien,
Austria
9Astronomical Society “Anonymus,” B. Radića 34, 31550
Valpovo, Croatia
Abstract. 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 25–100 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 -13.7 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. Križevci can be ranked
among the 10 best
documented meteorite falls.
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