Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of Two New L4 Neptune Trojans in the Dark Energy Survey
  Supernova Fields   We report the discovery of the eighth and ninth known Trojans in stable
orbits around Neptune's leading Lagrange point, L4. The objects 2014 QO$_{441}$
and 2014 QP$_{441}$ were detected in data obtained during the 2013-14 and
2014-15 observing seasons by the Dark Energy Survey, using the Dark Energy
Camera (DECam) on the 4-meter Blanco telescope at Cerro Tololo Inter-American
Observatory. Both are in high-inclination orbits (18.8$^{\circ}$ and
19.4$^{\circ}$ respectively). With an eccentricity of 0.104, 2014 QO$_{441}$
has the most eccentric orbit of the eleven known stable Neptune Trojans. Here
we describe the search procedure and investigate the objects' long-term
dynamical stability and physical properties.

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The categories of this paper are: physics
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: nlin
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The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph
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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: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: eess