[meteorite-list] Re:Plotting Months and Days - Part 1

From: E.P. Grondine <epgrondine_at_meteoritecentral.com>
Date: Thu Apr 22 09:50:29 2004
Message-ID: <20020426172832.31137.qmail_at_web11607.mail.yahoo.com>

Hello Bernd -

Great start, but...

It would seem to me that looking for 364 day cycles is
certainly a start, but that the cycles of intersection
of the Earth with meteorite streams is likely to
follow other patterns, patterns with other than 364
day time intervals between intersections.

As you point out, one aspect of the problem is
converting from calendat dates to some kind of
universal time - this may account for the clusters of
2-3 days which you have initally found. The other
part may be due to simple "stretching" of the
streams.

Congratulations on this initial yield, though. I
think that this is really important, as I am quite
concerned about some of the bigger chunks that may
exist in these meteorite streams.

ep


--- Bernd Pauli HD
<bernd.pauli_at_lehrer1.rz.uni-karlsruhe.de> wrote:
> 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
>
http://www.pairlist.net/mailman/listinfo/meteorite-list


__________________________________________________
Do You Yahoo!?
Yahoo! Games - play chess, backgammon, pool and more
http://games.yahoo.com/
Received on Fri 26 Apr 2002 01:28:32 PM PDT