The Moravka meteorite fall: 1. Description of the events and determination of the fireball trajectory and orbit from video records

The Moravka (Czech Republic) meteorite fall occurred on May 6, 2000, 11:52 UT, during the daytime. Six H5-6 ordinary chondrites with a total mass of 1.4 kg were recovered. The corresponding fireball was witnessed by thousands of people and also videotaped by 3 casual witnesses. Sonic booms were recorded by 16 seismic stations in the Czech Republic and Poland and by one infrasonic station in Germany. A total of 2.5% of the fireball eyewitnesses reported electrophonic sounds. Satellites in Earth orbit detected part of the fireball light curve. In this first paper from a series of 4 papers devoted to the Moravka meteorite fall, we describe the circumstances of the fall and determine the fireball trajectory and orbit from calibrated video records. Moravka becomes one of only 6 meteorites with a known orbit. The slope of the trajectory was 20.4degrees to the horizontal, the initial velocity was 22.5 km/s, and the terminal height of the fireball was 21 km. The semimajor axis of the orbit was 1.85 AU, the perihelion distance was 0.982 AU, and the inclination was 32.2degrees. The fireball reached an absolute visual magnitude of -20 at a height of 33 km.