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These past five years (from 1998 to 2002) have seen
some exceptional Leonid activity (for a full review of the
observations, see Arlt & Brown 1999, Arlt & Gyssens
2000, Arlt et al. 1999, 2001, 2002, and Jenniskens 2002).
For the first time, some accurate predictions have also
been possible, thanks to a better knowledge of the dy-
namics of meteoroids in the Solar System. Following
the work of Kondrat'eva & Reznikov (1985) and Kon-
drat'eva et al. (1997), it was shown (Asher, 1999; Mc-
Naught & Asher, 1999) that the orbit of the mete-
oroids, instead of the orbit of the parent body alone,
is relevant to achieve such predictions. At the same
time Lyytinen & Van Flandern (2000), from a `satellite
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