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Re: (meteorobs) Hale-Boppids redux...
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Jean-Christophe 'Papou' Millot | Computer and network consultant.
email : papou@canl.nc | Astronomy, Internet, Music, Movies.
snail mail : B.P. 3977 | Voice/Fax : Int'l + 687 27.69.84
Nouméa 98846 New-Caledonia | Mobile : Int'l + 687 77.19.97
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> De : Rainer Arlt <100114.1361@CompuServe.COM>
> A : Meteor Observers List <MeteorObs@latrade.com>
> Objet : (meteorobs) Hale-Boppids redux...
> Date : dimanche 16 mars 1997 20:50
>
> I wrote:
>
> >We may assume a typical diameter of the core component of a meteoroid
stream
> >like the Leonids of 10^5 km (~1 hour duration). Let the meteor number
> observable
> >be 100,000 per hour. Now we have to dilute this meteoroid number on a
> >cross-section with 0.1 AU diameter to reach the Earth. The ratio of the
> circular
> >areas with 10^5km and 1.5*10^7km is 440,000.
>
> I just noticed that I was wrong with the ratio; it's 22,500, giving 4
meteors
> per hour. Anyway, as this is a very optimistic upper limit, it's quite
unlikely
> to detect significant activity.
>
> Rainer
Rainer
I agree whith you and I have another point for the low possibility of
Hale-Boppids (on Earth)
Speaking about leonids, the Temple-Tuttle parent comet crosses the Earth's
orbit in a much closer range : 0 to 0.02 AU and meteoroids storms appears
best when closer to 0, and when the comet passes inside the Earth's orbit .
So if Hale-Bopp crossed at 1.1 AU the good position for Hale-Boppids
observations should be in the -0.02 to +0.01 AU range so that make 1.08 to
1.11 AU. May be there are lucky observers on an Apollo/Amor type asteroid
:-)
By the way I have a question : what is the "shape" of a whole meteor shower
in the solar system ? I mean, is it an elliptical pipe of circular section
or an elliptical rather flat ribbon or anything else ?
Jean-Christophe from cloudy New Caledonia (22S 166E) so no Gamma Normids
observations. I hope other southern observers have had better luck but
December to March is cloudy, rainy and even cyclonic down here.
Clear Skies