Physics – Optics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.244m&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Physics
Optics
Scientific paper
The Geminids is the densest annual meteoroid stream whose parent body is asteroid (3200) Phaethon, which was considered by some researchers as an ex-tinct cometary nucleous rather than a regular asteroid. On the basis of spectral and dynamical similarities, it has been recently proposed that asteroid 2 Pallas is the likely parent body of asteroid (3200) Phaeton. The asteroidal origin of the Geminids suggests that this stream could be a potential meteorite producer. The analysis of several Geminid fireballs observed on 2009 and 2010 from Spain supports this idea. The Geminid observations reported here were made on 2009 and 2010 from several video stations operated by the SPanish Meteor Network (SPMN). These employ high-sensitivity 1/2" black and white CCD video cameras endowed with fast aspherical optics. Some of these cameras are endowed with diffraction grattins in order to obtain emission spectra resulting from the ablation of meteoroids in the atmos-phere. Ten of these spectra have been obtained by the SPMN for Geminids fireballs in the last two years. The analysis of these spectra also suggest an asteroidal origin of the shower. Besides, Geminids meteoroids appear to be depleted in moderately volatile elements, such as Na. This is consistent with previous results supporting a chondritic similitude of 3200 Phaeton with cometary dust for the main rocky elements. Na dissimilitude could be explained by subsequent approaches to the Sun of the Geminid meteoroids, as temperature would cause a much significant depletion in volatile mineral phases when compared to other meteoroid streams. Consequently, 3200 Phaeton vola-tile content could be higher in volatiles than the shown by its Geminid fragments, and by reflectance spectra of its heated surface.
Madiedo José M.
Trigo-Rodríguez Josep M.
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