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The meteoroids left by the comet are organized in trails in orbits similar to though different from that of the comet.
They are differentially disturbed by the planets, in particular Jupiter and to a lesser extent by radiation pressure from the sun, the Poynting – Robertson effect, and the Yarkovsky effect.
Old trails are spatially not dense and compose the meteor shower with a few meteors per minute.
In the case of the Leonids, that tends to peak around November 17, but some are spread through several days on either side and the specific peak changing every year.
Conversely, young trails are spatially very dense and the cause of meteor showers when the Earth enters one.
Usual counts during a storm exceed 1000 meteors per hour, to be compared to the annual background ( 1 to 2 meteors per hour ) and the shower background ( a few per hour ).

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