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dc.contributor.authorMadiedo Gil, José María 
dc.contributor.authorTrigo Rodríguez, Josep María
dc.contributor.authorWilliams, I. P.
dc.contributor.authorCastro Tirado, Alberto J.
dc.contributor.authorLlorca, Jordi
dc.contributor.authorVítek, Stanislav
dc.contributor.authorJelinek, M.
dc.identifier.citationMADIEDO GIL, J.M.; TRIGO RODRÍGUEZ, J.M.; WILLIAMS, I.P.; CASTRO TIRADO, A.J.; LLORCA, J.; VITEK, S. y JELINEK, M. "A meteorite-dropping superbolide from the catastrophycally disrupted comet C1919Q2 metcalf : a pathway for meteorites from jupiter family comets". 40th Lunar and Planetary Science Conference. Marzo de 2009 The Woodlands, Texas, USA. Comunicación oral
dc.description.abstractIt is widely accepted that cometary nu- clei are composed of a mix of volatile ices and meteor- itic materials. In a series of seminal papers F. L. Whipple tried to explain how the irregular internal structure of each nuclei would be able to explain the nongravitational forces, and how the continuous sub- limation of the ice species would lead to explain the origin of meteoroid streams [1,2,3]. Not essential pro- gress was made until that the approach of a cruise of international spacecrafts to comet 1P/Halley allowed to achieve the first direct view of a cometary nucleus [4]. At that time several models were built to explain the main features observed in 1P/Halley nucleus under the main concept that cometary nuclei were born from the accretion of weakly bounded ice-rich cometesimals [5, 6]. A similar view was extracted from the 81P/Wild 2 fragile aggregates recovered by Stardust mission [7]. Obviously, particles recollected in the coma of a comet are biased towards those fragile aggregates that are lifted off from ice-rich regions by the sublimated gas drag. Many cometary meteoroid streams crossing the Earth were formed in this way, but not all. Catastro- phic disruption of cometary nuclei is also a regular mechanism of producing meteoroid streams [8, 9, 10]. Interestingly, this mechanism is able to produce large boulders as observed e.g. during the disruption of comet C/1999 S4 LINEAR [11]. It was believed that the large fragments released by these break-up events will proceed to faint in the coma due to suffer a cas- cade fragmentation. Obviously remote observations are not able to decipher if the final product of these events are mm- or m-sized meteoroids. In a recent pa- per [12] we identified a meter-sized meteoroid that was probably produced during the disintegration of comet C1919Q2 Metcalf. It produced a very bright fireball, with a maximum brightness of magn. –18 that was observed over much of Spain as well as parts of Portugal, and France on July 11, 2008 at 21:17:39 UTC. Fortuitously, it flew over many of the instru- ments operated by the SPanish Meteor and Fireball Network (SPMN) so that accurate measurements of its properties were recorded. Here we summarize both these observations and the deductions made from them regarding the nature and origin of the body that gave rise to this fireball.
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España
dc.titleA meteorite-dropping superbolide from the catastrophycally disrupted comet C1919Q2 metcalf : a pathway for meteorites from jupiter family cometsen_US

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