RT Conference Proceedings
T1 A meteorite-dropping superbolide from the catastrophycally disrupted comet C1919Q2 metcalf : a pathway for meteorites from jupiter family comets
A1 Madiedo Gil, José María
A1 Trigo Rodríguez, Josep María
A1 Williams, I. P.
A1 Castro Tirado, Alberto J.
A1 Llorca, Jordi
A1 Vítek, Stanislav
A1 Jelinek, M.
AB It 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 internalstructure of each nuclei would be able to explain thenongravitational forces, and how the continuous sub-limation of the ice species would lead to explain theorigin of meteoroid streams [1,2,3]. Not essential pro-gress was made until that the approach of a cruise ofinternational spacecrafts to comet 1P/Halley allowed toachieve the first direct view of a cometary nucleus [4].At that time several models were built to explain themain features observed in 1P/Halley nucleus under themain concept that cometary nuclei were born from theaccretion of weakly bounded ice-rich cometesimals [5,6]. A similar view was extracted from the 81P/Wild 2fragile aggregates recovered by Stardust mission [7].Obviously, particles recollected in the coma of a cometare biased towards those fragile aggregates that arelifted off from ice-rich regions by the sublimated gasdrag. Many cometary meteoroid streams crossing theEarth were formed in this way, but not all. Catastro-phic disruption of cometary nuclei is also a regularmechanism of producing meteoroid streams [8, 9, 10].Interestingly, this mechanism is able to produce largeboulders as observed e.g. during the disruption ofcomet C/1999 S4 LINEAR [11]. It was believed thatthe large fragments released by these break-up eventswill proceed to faint in the coma due to suffer a cas-cade fragmentation. Obviously remote observationsare not able to decipher if the final product of theseevents are mm- or m-sized meteoroids. In a recent pa-per [12] we identified a meter-sized meteoroid thatwas probably produced during the disintegration ofcomet C1919Q2 Metcalf. It produced avery brightfireball, with a maximum brightness of magn. –18 thatwas observed over much of Spain as well as parts ofPortugal, and France on July 11, 2008 at 21:17:39UTC. Fortuitously, it flew over many of the instru-ments operated by the SPanish Meteor and FireballNetwork (SPMN) so that accurate measurements of itsproperties were recorded. Here we summarize boththese observations and the deductions made from themregarding the nature and origin of the body that gaverise to this fireball.
YR 2009
FD 2009
LK http://hdl.handle.net/10272/3089
UL http://hdl.handle.net/10272/3089
LA eng
NO MADIEDO 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
DS Repositorio Institucional de la Universidad de Huelva
RD 15 jun 2026