[meteorite-list] Phil Plait "Bad Astronomy" Article - Chelyabinsk Parent Body

[Maurizio Eltri]

Hi Listees,

-I apologize for the automatic translation of the letter-

I'm certainly not an expert in the field and probably for this 
reason, I can not understand what 'I believe to be an inconsistency 
between the
work done by the authors (C. de la Fuente Marcos, R. de la Fuente 
Marcos) and some mineralogical analysis obtained by researchers 
Russian Academy of Sciences.
The latter showed that the rocks constituents
the meteorites falling in Chelyabinsk, have an age 'exposure to 
cosmic radiation of 31 million years.
While in the article in question, the two researchers say that the
asteroids probably belonging, as the source, to the same group which 
was part of the meteoroid Chelyabinsk, for reasons related to the 
gravitational perturbations exerted by Mars, Venus, Ceres and the 
Earth-Moon system, can not 'be more' old 20000 or 40000 years.
I would be inclined to think that a meteoroid of about 15 meters in 
31 million years has been subjected to so many actions both 
perturbative gravitational and non-gravitational, which today would 
be very unlikely to be able to identify the asteroid progenitor.
Perhaps the only alternative would be to assume that the impact 
suffered by the asteroid 31 million years ago ancestor of the 
meteoroid Chelyabinsk, was such as to have only brought to the 
surface of the asteroid itself rocks of the meteoroid. Or maybe not?

Maurizio Eltri

At 03:02 10/08/2013, Galactic Stone & Ironworks wrote:
>Hi Listees,
>
>An article by Phil Plait regarding the parent body of the 
>Chelyabinsk meteorite
>
>Link :
>
>http://www.slate.com/blogs/bad_astronomy/2013/08/08/chelyabinsk_meteor_astronomers_trace_it_back_to_a_potential_parent_asteroid.html#article_comment_box
>
>Best regards and clear skies,
>
>MikeG
>
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