A&A 439, 751-760 (2005)
A new method to predict meteor showers
I. Description of the modelJ. Vaubaillon1, F. Colas1 and L. Jorda2 1
Institut de mécanique céleste et de calcul des éphémérides - Observatoire de Paris, 77 avenue Denfert-Rochereau, 75014 Paris, France
Laboratoire d'Astrophysique de Marseille, Site Pereisc, BP 8, 13376 Marseille Cedex 12, France
(Received 28 June 2004 / Accepted 17 March 2005 )
Observations of meteor showers allow us to constrain several cometary parameter
and to retrieve useful parameters on cometary dust grains, for instance
the dust size distribution index s.
In this first paper, we describe a new model to compute the time and
level of a meteor shower whose parent body is a known periodic comet.
The aim of our work was to use all the available knowledge on cometary dust
to avoid most of the "a priori" hypotheses of previous meteoroid stream models.
The ejection velocity is based on a hydrodynamic model.
Because of the large amount of particles released by the comet,
it is impossible to compute the orbits of all of them.
Instead, we link each computed particle with the real number of meteoroids
ejected in the same conditions, through a "dirty snowball" cometary model calibrated
We used a massive numerical integration for all the particles without hypotheses about size distribution.
The time of maximum is evaluated from the position of the nodes of impacting meteoroids.
The model allows us to compute ephemerides of meteors showers and the spatial density of meteors streams, from which a ZHR can be estimated.
At the end a fit of our predictions with observations allows us to compute the dust size distribution index.
We used 2002 and 2003 leonid meteor showers to illustrate our method.
The application of our model to the Leonid meteor shower from 1833 to 2100 is given in Paper II.
meteors, meteoroids --
comets: general --
© ESO 2005