Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polarimetric Properties of the Near--Sun Asteroid (155140) 2005 UD in
  Comparison with Other Asteroids and Meteoritic Samples   The investigation of asteroids near the Sun is important for understanding
the final evolutionary stage of primitive solar system objects. A near-Sun
asteroid, (155140) 2005 UD, has orbital elements similar to those of (3200)
Phaethon (the target asteroid for the JAXA's $DESTINY^+$ mission). We conducted
photometric and polarimetric observations of 2005 UD and found that this
asteroid exhibits a polarization phase curve similar to that of Phaethon over a
wide range of observed solar phase angles ($ \alpha = 20 - 105^\circ $) but
different from those of (101955) Bennu and (162173) Ryugu (asteroids composed
of hydrated carbonaceous materials). At a low phase angle ($\alpha \lesssim
30^\circ$), the polarimetric properties of these near-Sun asteroids (2005 UD
and Phaethon) are consistent with anhydrous carbonaceous chondrites, while the
properties of Bennu are consistent with hydrous carbonaceous chondrites. We
derived the geometric albedo, $ p_\mathrm{V} \sim 0.1 $ (in the range of
0.088-0.109); mean $ V $-band absolute magnitude, $ H_\mathrm{V} = 17.54 \pm
0.02 $; synodic rotational period, $ T_\mathrm{rot} = 5.2388 \pm 0.0022 $ hours
(the two-peaked solution is assumed); and effective mean diameter, $
D_\mathrm{eff} = 1.32 \pm 0.06 $ km. At large phase angles ($ \alpha \gtrsim
80^\circ$), the polarization phase curve are likely explained by the dominance
of large grains and the paucity of small micron-sized grains. We conclude that
the polarimetric similarity of these near-Sun asteroids can be attributed to
the intense solar heating of carbonaceous materials around their perihelia,
where large anhydrous particles with small porosity could be produced by
sintering.

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The categories of this paper are: chem-ph
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The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: hep-lat
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The categories of this paper are: atom-ph
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The categories of this paper are: stat
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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: math
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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: bayes-an