The physical properties of the june bootids and de July 23, 2008 superbolide

Abstract

Many cometary meteoroid streams crossing the Earth were formed from the continuous sublimation of the ice-rich regions in cometary nuclei [1,2,3]. Another mechanism of producing cometary meteoroid streams is the catastrophic disruption of cometary nuclei [4,5,6]. In that case the existence of cometary meteoroid streams containing meter-sized meteoroids capable of producing meteorites after atmospheric interaction is quite real. Their existence has important implications because they can be naturally delivering to the Earth different types of materials from comets. Establishing a link between meteorites and their parent bodies is a key issue in planetary sciences. The Orgueil cometary meteorite which has an orbit similar to that of Jupiter-family comets (JFCs) fell in southern France on May 14, 1864 [7]. Despite the very fragile and incoherent nature of the Orgueil stone, the recovered thrity-three stones are now present in several collections around the world. A cometary origin of the Orgueil meteorite-dropping bolide does not contradict cosmochemistry data on CII chondrites. The fall of the Tagish Lake carbonaceous chondrite meteorite on January 18, 2000 was caused by the already known μ–Orionid fireball stream [8] and also as in case of the Orgueil meteorite has a density 1.6 g/cm3. The initial fragmentation must have occurred under an aerodynamic pressure of about 0.3 MPa. We present here data on a recent superbolide event occurred over Tajikistan on July 23, 2008 associated with the 7P/Pons-Winnecke comet