Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 67P/Churyumov-Gerasimenko - potential target for the Rosetta mission   An influence of the non-gravitational effects on the motion of short-period
comet 67P/Churyumov-Gerasimenko is investigated. It was found that the normal
component of the non-gravitational force exceeds the transverse one and a model
of the motion including A_1, A_2, A_3 better fits the observations than model
neglecting A_3. Assuming asymmetry in g(r) with respect to the perihelion the
large value of displacement \tau was derived (about 34 days), and very small
negative value of transverse component A_2 was obtained. The models of rotating
non-spherical nucleus also suggest the large shift of light curve with respect
to perihelion (\tau greater than 30 days). The forced precession model of 67P
with \tau = 34 days gives a prolate spheroidal shape of the rotating nucleus
with axial ratio R_b/R_a = 1.16, rotational period to equatorial radius
P_{rot}/R_a = 4.6\pm 1.4 hrs/km, and torque factor f_{tor}=3\cdot 10^5 day/AU.
The much larger \tau = 54 days gives distinctly prolate shape of nucleus with
axial ratio R_b/R_a = 1.71. The orientation of spin axis of the nucleus and its
evolution are presented. The past and the future dynamical evolution of comet
67P is also widely discussed.

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The categories of this paper are: cond-mat
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The categories of this paper are: hep-th
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The categories of this paper are: math
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The categories of this paper are: gr-qc
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The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: q-bio
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: physics