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RE: R: (meteorobs) WM1 shower?
With regard to the Aurigids and Comet Kiess, I agree, though the maximum
rate for this shower has never been observed to exceed a ZHR of 40.
There is no doubt that Kiess is a long period comet, with a period of
~6300 years.
I stand corrected - thank you for bringing this to my attention. I
amend my statement to state that only periodic comets can produce
meteor showers. You learn something every day in this field :)
However, with regard to the alpha Monocerotids, your paper states
that there is a 98% probability that the period of the parent comet
exceeds 140 years. Since a long period comet's period must exceed
or equal 200 years, your results do not rule out a short period
comet as a progenitor for this shower; indeed the uncertainties
in your 1/a measurements exceed the determinations for all but
one of your points. In short, all you can really say is that the
1/a for the shower meteors is less than your experimental uncertainty,
which appears to be on the order of 0.05 AU^-1.
Regards,
Bill Cooke
CSC/ED44
Marshall Space Flight Center, AL 35812
Phone: (256) 544-9136
FAX: (256) 544-0242
Email: bill.cooke@msfc.nasadot gov
> -----Original Message-----
> From: Marco Langbroek [mailto:marco.langbroek@wanadoodot nl]
> Sent: Monday, December 10, 2001 1:45 PM
> To: meteorobs@atmob.org
> Subject: Re: R: (meteorobs) WM1 shower?
>
>
>
> ----- Original Message -----
> From: "Cooke, Bill" <Bill.Cooke@msfc.nasadot gov>
> Sent: Monday, December 10, 2001 4:33 PM
>
> > Comet WM1 is a long period comet, and meteor showers are
> only produced
> > by short period comets.
>
> I am sorry, but this is incorrect. The Aurigids on September
> 1 (both an
> annual stream and producing outbursts) are due to a long period comet,
> C/Kiess. And the alpha Monocerotids in November with big
> outbursts in 1925,
> 1935, 1985 and 1995 are due to a long period comet, see our
> paper in the
> Astrophysical Journal (Jenniskens P., Betlem H., De Lignie M.
> and Langbroek
> M.: The detection of a dust trail in the orbit of an Earth-threatening
> long-period comet. The Astrophysical Journal 479 (1997), 441-447).
>
> For the rest of course you are right: only an encounter with
> 'old' dust
> would be possible, not with dust from the current perihelion passage.
>
> Marco Langbroek (DMS)
>
>
> ---
> Marco Langbroek private: marco.langbroek@wanadoodot nl
> Leiden University work:
> m.langbroek@arch.leidenunivdot nl
> Faculty of Archaeology
> P.O. Box 9515
> http://home.wanadoodot nl/marco.langbroek/
> NL-2300 RA Leiden
> The Netherlands
> ---
>
>
>
>
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If you are interested in complete links on the 2001 LEONIDS, see:
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