The outburst of the κ Cygnids in 2007: clues about the catastrophic break up of a comet to produce an Earth-crossing meteoroid stream

Using high-resolution, low-scan-rate, all-sky CCD cameras and high-level CCD video cameras, the SPanish Meteor and fireball Network (SPMN) recorded the 2007 κ Cygnid fireball outburst from several observing stations. Here, accurate trajectory, radiant and orbital data obtained for the κ Cygnid meteor are presented. The typical astrometric uncertainty is 1–2 arcmin, while velocity determination errors are of the order of 0.3–0.6 km s −1 , though this depends on the distance of each event to the station and its particular viewing geometry. The observed orbital differences among 1993 and 2007 outbursts support the hypothesis that the formation of this meteoroid stream is a consequence of the fragmentation of a comet nucleus. Such disruptive process proceed as a cascade, where the break up of the progenitor body leads to produce small remnants, some fully disintegrate into different clumps of particles and other remaining as dormant objects such as 2008ED69, 2001MG1 and 2004LA12 which are now observed as near-Earth asteroids. In addition to the orbital data, we present a unique spectrum of a bright κ Cygnid fireball revealing that the main rocky components have chondritic abundances, and estimations of the tensile strength of those fireballs that exhibited a catastrophic disruption behaviour. All this evidence of the structure and composition of the κ Cygnid meteoroids is consistent with being composed by fine-grained materials typically released from comets.

[1]  J. Vaubaillon,et al.  MINOR PLANET 2008 ED69 AND THE KAPPA CYGNID METEOR SHOWER , 2008 .

[2]  J. Trigo-Rodríguez,et al.  Multi-station Video Orbits of Minor Meteor Showers , 2008 .

[3]  I. Williams,et al.  Meteor showers associated with 2003EH1 , 2008 .

[4]  I. Williams,et al.  Near-Earth asteroids among the Piscids meteoroid stream , 2008 .

[5]  Peter S. Gural,et al.  Determination of Meteoroid Orbits and Spatial Fluxes by Using High-Resolution All-Sky CCD Cameras , 2008 .

[6]  J. Trigo-Rodríguez,et al.  The 2006 Orionid outburst imaged by all-sky CCD cameras from Spain: meteoroid spatial fluxes and orbital elements , 2007 .

[7]  J. Vaubaillon,et al.  3D/Biela and the Andromedids: Fragmenting versus Sublimating Comets , 2007 .

[8]  I. Williams,et al.  How useful is the ‘mean stream’ in discussing meteoroid stream evolution? , 2007 .

[9]  Alberto J. Castro-Tirado,et al.  The Spanish fireball network , 2006 .

[10]  Jordi Llorca,et al.  The strength of cometary meteoroids: clues to the structure and evolution of comets , 2006 .

[11]  P. Jenniskens.  Meteor Showers and their Parent Comets , 2006 .

[12]  I. Williams,et al.  The Kappa Cygnid meteoroid complex , 2006 .

[13]  A. U. Postigo,et al.  The Development of the Spanish Fireball Network Using a New All-Sky CCD System , 2006 .

[14]  J. Ortiz,et al.  2002 Leonid storm fluxes and related orbital elements , 2004 .

[15]  P. Jenniskens.  2003 EH1 Is the Quadrantid Shower Parent Comet , 2004 .

[16]  J. Borovička,et al.  Chemical abundances determined from meteor spectra: I. Ratios of the main chemical elements , 2003 .

[17]  I. Williams,et al.  Meteors in the Earth's Atmosphere , 2002 .

[18]  I. Williams,et al.  The ejection velocity of meteoroids from cometary nuclei deduced from observations of meteor shower outbursts , 2001 .

[19]  F. Rietmeijer.  Interrelationships among meteoric metals, meteors, interplanetary dust, micrometeorites, and meteorites , 2000 .

[20]  R. Jehn,et al.  Testing cometary ejection models to fit the 1999 Leonids and to predict future showers , 2000 .

[21]  D. Asher.  The Leonid meteor storms of 1833 and 1966 , 1999 .

[22]  H. Betlem,et al.  Precision meteor orbits obtained by the Dutch Meteor Society - Photographic Meteor Survey (1981-1993) , 1998 .

[23]  P. Brown,et al.  Visual observations of the Perseid meteor shower 1988-1994 , 1997 .

[24]  I. Williams,et al.  On the Quadrantid meteoroid stream complex , 1992 .

[25]  Mark V. Sykes,et al.  Cometary dust trails: I. Survey , 1992 .

[26]  George W. Wetherill,et al.  Where do the Apollo objects come from , 1988 .

[27]  G. Kronk.  Meteor Showers: A Descriptive Catalog , 1988 .

[28]  F. Verniani.  Structure and fragmentation of meteoroids , 1969 .

[29]  F. Whipple.  Photographic meteor orbits and their distribution in space , 1954 .

[30]  W. Denning.  The August Meteors, 1893 , 1893, Nature.

[31]  J. Llorca,et al.  On the sodium overabundance in cometary meteoroids , 2007 .

[32]  J. Trigo-Rodríguez,et al.  On the sodium abundance in cometary meteoroids , 2004 .

[33]  I. Williams,et al.  Meteoroid ejection velocities deduced from a study of the April Lyrid meteor shower , 2002 .

[34]  Y. Obrubov.  A new octuple Earth-crossing meteoroid stream , 1995 .

[35]  B. Lindblad.  The orbit of the Kappa Cygnid and related meteor streams , 1995 .

[36]  R. E. Munn,et al.  GEOPHYSICS AND ASTROPHYSICS MONOGRAPHS , 1972 .

[37]  E. J. Oepik,et al.  The stray bodies in the solar system. i - survival of cometary nuclei and the asteroids. , 1963 .