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Re: (meteorobs) Fwd: Meteor's family poses puzzle - Intriguing!
Marco L.,
thanks for pointing that out - i had a feeling it may have been discussed
before on here. I will have a search through the archives tonight. I was
also thinking of the "ruble pile" explanation and perhaps the
possibility of a parent body,with another captured(satellite) body(i
remember reading somewhere recently that a quite high proportion of
objects are thought to have satellites of their own),although i have a
feeling this would be much less lightly.
Regarding the CRE - I wonder if the age calculations take into account
that the sun may have been more active in the past,therefore skewing the
age to the older end of the spectrum ?
Leo
At 11:24 26/05/03 +0200, you
wrote:
- FYI,
-
- The meteorites Leo and Marco V. are talking about, are Pribram (6
april 1959) and Neuschwanstein (6 april 2002). Pribram is a H5 chondrite,
Neuschwanstein a E6 (E=Enstatite) chondrite. The Dutch Glanerbrug
meteorite (7 april 1990), an LL5, also has a quite similar orbit
(determined from visual observations). They might all three originate
from one 'rubble pile' parent asteroid. A 'rubble pile' originates when
after a collision between two or more objects, fragments of these
multiple objects reassemble again into one body due to gravitational
binding.
-
- Concerning the meteor aspect (as this is a meteor observer's list):
radiant positions are: alpha 192, delta +19 (Pribram); alpha 192, delta
+17 (Neuschwanstein); alpha 202, delta +49 (Glanerbrug). Velocities 21-23
km/s. For those interested in the details, see paper by Spurny et al. in
Nature 8 May 2003, and my paper in 'Radiant' (J. DMS) of September 2001.
Note that the radiant area has a diameter of some 30 degrees, stretching
from Coma Berenices into Canes Venatici.
-
- What is much more 'problematic' than the difference in chemical
classifications, is the CRE (Cosmic Ray Exposure) ages for these objects.
They suggest they orbited the sun as small (i.e. meteorite sized) objects
for tens of millions of years, which seems at odds with an intact stream.
This paradox has not yet been satisfactorily solved. Personally, I think
it could mean that CRE ages are not what people think they are.
-
- I think that Neuschwanstein and Pribram have been discussed on this
list a year ago following the Neuschwanstein fireball and subsequent
meteorite recovery a few months later. So Leo and Marco V. might want to
check up the list archives.
-
- - Marco Langbroek
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