(meteorobs) 1972 Draconids [was 2005 Draconids]

[Jeff Wilson]

YORP=  ?


Jeff


----- Original Message -----
From: "Malcolm J. Currie" <mjc at star.rl.ac.uk>
To: "Global Meteor Observing Forum" <meteorobs at meteorobs.org>
Sent: Tuesday, January 25, 2005 11:27 AM
Subject: (meteorobs) 1972 Draconids [was 2005 Draconids]


> MJC> > Do the models explain what happened in 1972, when the possibility
of a
> MJC> > storm was touted, but almost no visual activity was present.
>
> HL> I did some trail computing of the Draconids years ago. Yes - the lack
in
> HL> activity in 1972 is easily explainable,
>
> Right, using today's models there was no encounter with a concentration
> of particles.  I'm wondering why _at the time_ there was an expectation
> of at least abnormal activity.  There was the closeness of the orbits
> crossing only a couple of months after the comet.  So my question is
> more, what physics has been introduced to our models which move the
> particles away from the comet orbit, thus making the 1972 Draconids a
> disappointment.  Poynting-Robertson was well known.  YORP, ejection
> velocity distributions, planetary perturbations?
>
> Malcolm
>
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