Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modeling optical roughness and first-order scattering processes from
  OSIRIS-REx color images of the rough surface of asteroid (101955) Bennu   The dark asteroid (101955) Bennu studied by NASA\textquoteright s OSIRIS-REx
mission has a boulder-rich and apparently dust-poor surface, providing a
natural laboratory to investigate the role of single-scattering processes in
rough particulate media. Our goal is to define optical roughness and other
scattering parameters that may be useful for the laboratory preparation of
sample analogs, interpretation of imaging data, and analysis of the sample that
will be returned to Earth. We rely on a semi-numerical statistical model aided
by digital terrain model (DTM) shadow ray-tracing to obtain scattering
parameters at the smallest surface element allowed by the DTM (facets of
\textasciitilde{}10 cm). Using a Markov Chain Monte Carlo technique, we solved
the inversion problem on all four-band images of the OSIRIS-REx
mission\textquoteright s top four candidate sample sites, for which
high-precision laser altimetry DTMs are available. We reconstructed the \emph{a
posteriori} probability distribution for each parameter and distinguished
primary and secondary solutions. Through the photometric image correction, we
found that a mixing of low and average roughness slope best describes Bennu's
surface for up to $90^{\circ}$ phase angle. We detected a low non-zero specular
ratio, perhaps indicating exposed sub-centimeter mono-crystalline inclusions on
the surface. We report an average roughness RMS slope of $27_{-5}^{\circ+1}$, a
specular ratio of $2.6_{-0.8}^{+0.1}\%$, an approx. single-scattering albedo of
$4.64_{-0.09}^{+0.08}\%$ at 550 nm, and two solutions for the back-scatter
asymmetric factor, $\xi^{(1)}=-0.360\pm0.030$ and $\xi^{(2)}=-0.444\pm0.020$,
for all four sites altogether.

22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
2
The categories of this paper are: math