[meteorite-list] Re:Plotting Months and Days

From: E.P. Grondine <epgrondine_at_meteoritecentral.com>
Date: Thu Apr 22 09:50:29 2004
Message-ID: <20020426171454.3176.qmail_at_web11606.mail.yahoo.com>

Hi all -

My orbital mechanics are weak to the point of
non-existence right now, but it seems to me that
trying to identify meteorite streams will involve the
following:

1) Converting the fall data to some kind of universal
time - in particular, their were several different
calendars in use

2) Separating the fall data by very specific meteorite
types

3) Taking differences

4) Then looking for displacements and multiples of
displacements

5) if reults are found, also considering bolide data

All this assumes a regular cyclic pattern of
intersection, and the orbits of some streams probably
wouldn't follow this pattern, so

6) having found any cyclic patterns, then looking for
non-cyclic patterns based on orbits derived from
viewer reports

ep




--- FRANK B CRESSY <fcressy_at_prodigy.net> wrote:
> Hello Bernd, Al and all,
>
> I had already done this for the aubrites (easy,
> there are only nine falls).
> Although its a very small group and may not be
> statistically relevant, there
> are two clusters; one at April 8 & 9, and one at
> August 2 & 3.
> The aubrite falls, from earliest to most recent are:
> Sept. 14, 1836 Aubres
> March 25, 1943 Bishopville
> Dec. 2, 1852 Bustee
> April 9, 1919 Cumberland Falls
> April 8, 1932 Khor Temiki
> Oct. 2, 1933 Pesyanoe
> Aug. 2, 1946 Pena Blanca Springs
> Feb. 18, 1948 Norton County
> Aug. 3, 1974 Mayo Belwa
>
> And just to get the humor out of the way, I'll be
> the first one who notices
> that "nearly half of the Aubrite falls occur in
> months starting with the
> letter "A".
> A coincidence? You be the judge ;-)
>
> Regards,
> Frank
>
>
> ----- Original Message -----
> From: Bernd Pauli HD
> <bernd.pauli_at_lehrer1.rz.uni-karlsruhe.de>
> To: meteorite-list
> <meteorite-list_at_meteoritecentral.com>; Al Mitterling
> <almitt_at_kconline.com>
> Sent: Thursday, April 25, 2002 1:36 PM
> Subject: [meteorite-list] Plotting Months and Days -
> Part 1
>
>
> > AL recently had a brilliant idea:
> >
> > > I wonder if anyone has tried to plot months and
> days related to
> > > meteorite classes to see if any correlation of
> types on certain
> > > fall days exists? If streams could be predicted
> then we could have
> > > watchers for this material coming down, plotting
> the falls with
> > > various observers or camera networks.
> >
> > A tremendous amount of database work - and I have
> only
> > been able to do the query for H chondrites so far
> - but the
> > first results look very, very promising!!!
> >
> > In a first run, I've looked for multiple falls for
> all of the 12 months
> > and the respective days of the months for all of
> the H3, H4, H5, H6
> > chondrite falls. I did not include the H3-4, H3-5,
> H3-6, H4-5, and
> > the H5-6 types because, statistically, they are
> irrelevant.
> >
> > Here are my first results:
> >
> > a) Total H4 chondrites Oct 31: 02
> >
> > b) Total H5 chondrites Feb 26: 02
> > c) Total H5 chondrites Apr 10: 02
> > d) Total H5 chondrites May 02: 02
> > e) Total H5 chondrites May 24: 02
> > f) Total H5 chondrites May 27: 02 [time interval
> between (e)/(f)]
> > g) Total H5 chondrites Jun 16: 02 [only three
> days]
> > h) Total H5 chondrites Jul 24: 02
> >
> > > i) Total H5 chondrites Aug 11: 02*
> > > j) Total H5 chondrites Aug 12: 02*
> >
> > > k) Total H5 chondrites Sep 04: 02**
> > > l) Total H5 chondrites Sep 05: 03**
> >
> > m) Total H5 chondrites Oct 11: 02
> > n) Total H5 chondrites Nov 12: 02
> > o) Total H5 chondrites Nov 17: 02
> > p) Total H5 chondrites Nov 26: 02
> > q) Total H5 chondrites Dec 30: 02
> >
> > > r) Total H6 chondrites Jan 19: 03***
> > s) Total H6 chondrites Jun 12: 02
> > t) Total H6 chondrites Sep 23: 02
> > u) Total H6 chondrites Sep 29: 02
> > v) Total H6 chondrites Oct 20: 02
> > w) Total H6 chondrites Nov 05: 02
> >
> > * There is a noticeable "clustering" around Aug
> 11, 12
> > with four H5 chondrites on two successive days
> !
> >
> > ** An even "denser" clustering for Sep 04, 05
> > with a total of five H5 chondrites !!
> >
> > *** Three H6 chondrites on Jan 19! But, as AL
> already mentioned
> > the next step would be that one has to find
> out whether there
> > is a leap year not only for these three falls
> but for all of them!
> >
> > We should always keep in mind that this is a
> purely statistical survey
> > and thus should not infer too quickly that these
> clusterings represent a
> > true orbital distribution of meteorite groups -
> Corrections would have
> > to be made for the Earth's diurnal and annual
> rotation, time zones, the
> > meteoroids' orbital parameters and orbital
> dimensions, just to mention
> > a few that come to mind! But still I think that we
> have just begun to
> > scratch the tip of the iceberg !
> >
> > More will follow soon - time permitting ... My
> next database query will
> > more closely examine the H chondrites with
> subsequent fall days, i.e.:
> > Apr 17 and Apr 18, etc.
> >
> >
> > Best wishes,
> >
> > Bernd
> >
> > ______________________________________________
> > Meteorite-list mailing list
> > Meteorite-list_at_meteoritecentral.com
> >
>
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>
>
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Received on Fri 26 Apr 2002 01:14:54 PM PDT