[meteorite-list] Re: The Pribram/Neuschwanstein Meteoroid Stream Is Not Dead

From: Herbert Raab <herbert.raab_at_meteoritecentral.com>
Date: Thu Apr 22 10:08:30 2004
Message-ID: <3D90CD37.2B8C8ACB_at_utanet.at>

E.P. Grondine writes:
> I suppose that ultimately this may all go back to
> whether or not Jupiter occupied its current orbit
> before the LPBE (Late Period Bombarment Event) - my
> guess is that it did not.

As far as I can say, the location of Jupiter's orbit during
the Late Heavy Bombardment (if it has changed at all) has no
influence on the meteorid streams we see today. Meteorid
streams "live" for a few Ma beore they are disrupted by
perturbations from the planets, whilst the Late Heavy
Bombardment ended ~3.8 Ga ago. If a Pribram/Neuschwanstein
Meteoroid Stream really exists, then it probably traces back
to a much younger event.

There are some great simulations of colliding rubble pile
asteroids at this web site:

  http://www.astro.umd.edu/~dcr/Research/rubble.html

When looking at these animations, just think of one rubble pile
asteroid made of H-type material, and of the other made of
E-chondrites: At the end, you get a new rubble pile, where H-
and E-type material is mixed, plus a number of H- and E-type
fragments that escape. These fragemnts will probaly share similar
orbits - in other words, the form an meteorid stream that includes
both H and E-type material.

Enjoy the animations... ;^)

Greetings,
  Herbert
Received on Tue 24 Sep 2002 04:38:15 PM PDT