Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chelyabinsk meteorite explains unusual spectral properties of Baptistina
  Asteroid Family   We investigated the spectral and compositional properties of Chelyabinsk
meteorite to identify its possible parent body in the main asteroid belt. Our
analysis shows that the meteorite contains two spectrally distinct but
compositionally indistinguishable components of LL5 chondrite and shock
blackened/impact melt material. Our X-ray diffraction analysis confirms that
the two lithologies of the Chelyabinsk meteorite are extremely similar in modal
mineralogy. The meteorite is compositionally similar to LL chondrite and its
most probable parent asteroid in the main belt is a member of the Flora family.
Intimate mixture of LL5 chondrite and shock blackened/impact melt material from
Chelyabinsk provides a spectral match with (8) Flora, the largest asteroid in
the Flora family. The Baptistina family and Flora family overlap each other in
dynamical space. Mineralogical analysis of (298) Baptistina and 9 small family
members shows that their surface compositions are similar to LL chondrites,
although their absorption bands are subdued and albedos lower when compared to
typical S-type asteroids. A range of intimate mixtures of LL5 chondrite and
shock blackened/impact melt material from Chelyabinsk provides spectral matches
for all these BAF members. We suggest that the presence of a significant
shock/impact melt component in the surface regolith of BAF members could be the
cause of lower albedo and subdued absorption bands. The parent asteroid of BAF
was either a member of the Flora family or had the same basic composition as
the Floras (LL Chondrite). The shock pressures produced during the impact event
generated enough impact melt or shock blackening to alter the spectral
properties of BAF, but keep the BAF composition largely unchanged.

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The categories of this paper are: bayes-an
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The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: nlin
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The categories of this paper are: patt-sol
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The categories of this paper are: cond-mat
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: q-bio
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: ao-sci