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Spectroscopic Observations of the 2011 Draconids Meteor Shower |
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| Authors: | Regina Rudawska Joe Zender Peter Jenniskens Jeremie Vaubaillon Pavel Koten Anastasios Margonis Juraj Tóth Jonathan McAuliffe Detlef Koschny |
| Institution: | 1. Institut de Mécanique Céleste et de Calcul des éphémérides – Observatoire de Paris, 77 avenue Denfert-Rochereau, 75014, Paris, France 2. ESA European Space Research and Technology Centre, Noordwijk, The Netherlands 3. SETI Institute, 189 Bernardo Ave, Mountain View, CA, 94043, USA 4. Astronomical Institute, Academy of Sciences, CZ25165 Ondrejov, Czech Republic 5. Technical University of Berlin, Department of Geodesy and Geoinformation Science, Strasse des. 17. Juni 135, 10623, Berlin, Germany 6. Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia 7. ISDEFE/ESA, Madrid, Spain |
| Abstract: | Some past October Draconid shower meteoroids fell apart in a spray of fragments at the end of their trajectory before slowing down, from which it was concluded that these were among the most fragile meteoroids known. In those instances, the dust could not be reliably traced to a particular return of the parent comet 21P/Giaconini-Zinner. On October 8th, 2011, Earth was predicted to transverse the 1900 A.D. dust ejecta of the comet. In 1900, the comet’s perihelion distance first moved significantly inwards to the Sun and ejection conditions could have been unusual. An airborne observing campaign was organized, with several teams contributing imaging and spectrographic cameras to study the manner in which these meteoroids released the volatile element sodium during the ablation process in the Earth’s atmosphere. IMCCE, ESA, and the SETI Institute contributed spectrographic cameras based on low-light WATEC 902H2 Ultimate, low-light LCC1, and GenII XX1332 image intensified cameras. An outburst was observed, much as predicted. Despite a lack of bright meteors, a total of 15 Draconid spectra were recorded. All show evidence of an early release of sodium. The loss of sodium was observed to coincide with the formation of a distinct wake of fragments. The observations show that 21P/Giacobini-Zinner ejected fragile meteoroids during the return in 1900. Those grains may have lost some sodium even before impacting Earth. |
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