Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unusual polarimetric properties of (101955) Bennu: similarities with
  F-class asteroids and cometary bodies   We have obtained polarimetric measurements of asteroid (101955) Bennu, a
presumably primitive near-Earth object (NEO) that is the target of NASA's
sample return mission OSIRIS-REx. During our observing campaign, Bennu was
visible from Earth under a wide range of illumination conditions, with
phase-angle in the range 16 to 57 degrees. Together with (3200) Phaethon and
(152679) 1998 KU2, observed very recently, Bennu is the only existing example
of a primitive NEO observed in polarimetric mode over a wide interval of phase
angles. Based on our polarimetric data, we propose that Bennu belongs to the
unusual F taxonomic class defined in the 80s. According to previous works, the
F-class includes objects with cometary features. This fact can be of great
importance for the interpretation of the results of the exploration of this
object by OSIRIS-REx. From polarimetry we also derive an estimate of the
geometric albedo of Bennu: 0.059 +/- 0.003.

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The categories of this paper are: cs
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-ex
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The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph