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Sur la complexité de la recherche de corps parents de pluies de météores : exploitation des données du réseau de caméras CABERNET

Abstract : Why are parent bodies of well-known meteors showers so hard to find ? Despite the development of cameras networks dedicated to their observation, still 80% of the parent bodies of established meteor showers still need to be identified. The main reason for this lack of efficiency is an important uncertainty on the orbit determination of meteoroids. The inaccurate estimates of the velocity and deceleration measurements of meteors are highly responsible for the actual discrepancy between the theoretical and measured orbits and prevent the determination of the orbital origin of meteoroids. In this work, we have shown that visual observations of fireballs cannot lead to a correct estimate of these parameters, and should not be taken into account for any orbit computation. From observations and thousands of simulations, we have compared several methods widely used to compute the velocity of meteors recorded by photographic and video networks. It appears that our implementation of the multi-parameter fitting method is the most reliable and precise technique to compute the trajectory and the velocity of these objects, and leads to an accuracy of about 1% on the pre-atmospheric velocity of the meteoroids recorded by CABERNET. Finally, we have set up a protocol to estimate the duration the position of a meteoroid and its parent body are known with enough precision to be correlated. This traceability duration limit (TDL) highly depends on the accuracy of the data reduction techniques, and may not exceed a few decades in the case of poor quality measurements. Nowadays, the CABERNET project is entering a prolific exploitation phase and will efficiently and reliably contribute to the identification of new parent bodies of meteor showers.
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https://tel.archives-ouvertes.fr/tel-01784885
Contributor : Abes Star :  Contact
Submitted on : Thursday, May 3, 2018 - 7:32:07 PM
Last modification on : Wednesday, September 23, 2020 - 4:38:45 AM
Long-term archiving on: : Tuesday, September 25, 2018 - 1:48:43 PM

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  • HAL Id : tel-01784885, version 1

Citation

Auriane Egal. Sur la complexité de la recherche de corps parents de pluies de météores : exploitation des données du réseau de caméras CABERNET. Astrophysique [astro-ph]. Université Paris sciences et lettres, 2017. Français. ⟨NNT : 2017PSLEO003⟩. ⟨tel-01784885⟩

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