Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: NEAT, An Astrometric Telescope To Probe Planetary Systems Down To The
  Earth Mass Around Nearby Solar-Type Stars   The NEAT (Nearby Earth Astrometric Telescope) mission is a proposition
submitted to ESA for its 2010 call for M-size mission. The main scientific goal
is to detect and characterize planetary systems in an exhaustive way down to 1
Earth mass in the habitable zone and further away, around nearby stars for F,
G, and K spectral types. This survey would provide the actual planetary masses,
the full characterization of the orbits including their inclination, for all
the components of the planetary system down to that mass limit. Extremely-
high-precision astrometry, in space, can detect the dynamical effect due to
even low mass orbiting planets on their central star, reaching those scientific
goals. NEAT will continue the work performed by Hipparcos (1mas precision) and
Gaia (7{\mu}as aimed) by reaching a precision that is improved by two orders of
magnitude (0.05{\mu}as, 1{\sigma} accuracy). The two modules of the payload,
the telescope and the focal plane, must be placed 40m away leading to a
formation flying option studied as the reference mission. NEAT will operate at
L2 for 5 years, the telescope satellite moving around the focal plane one to
point different targets and allowing whole sky coverage in less than 20 days.
The payload is made of 3 subsystems: primary mirror and its dynamic support,
the focal plane with the detectors, and the metrology. The principle is to
measure the angles between the target star, usually bright (R \leq 6), and
fainter reference stars (R \leq 11) using a metrology system that projects
dynamical Young's fringes onto the focal plane. The proposed architecture
relies on two satellites of about 700 kg, offering a capability of more than
20,000 reconfigurations. The two satellites are launched in a stacked
configuration using a Soyuz ST launch, and are deployed after launch to
individually perform cruise to their operational Lissajous orbit.

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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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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: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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The categories of this paper are: cond-mat
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The categories of this paper are: stat