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RE: (meteorobs) Perseid stream spread (was: NAMN Notes: July 1999)
Lew Gramer wrote:
>So why DO the PERs have such spread in orbital elements??<
Lew: May I take a wild stab at this? Could it possibly be due to
perturbations caused by Earth's passage through the stream each year? The
orbit of the meteoroids is so highly inclined to the ecliptic, and it has
such high eccentricity, I don't think we can blame perturbations on any of
the large planets.
Perhaps more likely (thinking along the same lines), it is possible that
Earth and the Perseid's parent comet, 1862III, Swift-Tuttle, have had one
or more close encounters in the past.
George Kelley
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