Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamical evolution of near-Earth asteroid 1991 VG   The discovery of 1991 VG on 1991 November 6 attracted an unprecedented amount
of attention as it was the first near-Earth object (NEO) ever found on an
Earth-like orbit. At that time, it was considered by some as the first
representative of a new dynamical class of asteroids, while others argued that
an artificial (terrestrial or extraterrestrial) origin was more likely. Over a
quarter of a century later, this peculiar NEO has been recently recovered and
the new data may help in confirming or ruling out early theories about its
origin. Here, we use the latest data to perform an independent assessment of
its current dynamical status and short-term orbital evolution. Extensive N-body
simulations show that its orbit is chaotic on time-scales longer than a few
decades. We confirm that 1991 VG was briefly captured by Earth's gravity as a
minimoon during its previous fly-by in 1991-1992; although it has been a
recurrent transient co-orbital of the horseshoe type in the past and it will
return as such in the future, it is not a present-day co-orbital companion of
the Earth. A realistic NEO orbital model predicts that objects like 1991 VG
must exist and, consistently, we have found three other NEOs --2001 GP2, 2008
UA202 and 2014 WA366-- which are dynamically similar to 1991 VG. All this
evidence confirms that there is no compelling reason to believe that 1991 VG is
not natural.

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The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: cs
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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The categories of this paper are: math
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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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: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: econ