Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Distances to the globular clusters 47 Tucanae and NGC 362 using Gaia DR2
  parallaxes   Using parallaxes from Gaia DR2, we estimate the distance to the globular
clusters 47 Tuc and NGC 362, taking advantage of the background stars in the
Small Magellanic Cloud and quasars to account for various parallax systematics.
We found the parallax to be dependent on the Gaia DR2 G apparent magnitude for
stars with $13<\textrm{G}<18$ , where brighter stars have a lower parallax zero
point than fainter stars. The distance to 47 Tuc was found to be
$4.45\pm0.01\pm0.12$ kpc, and for NGC 362 $8.54\pm0.20\pm0.44$ kpc with random
and systematic errors listed respectively. This is the first time a precise
distance measurement directly using parallaxes has been done for either of
these two globular clusters.

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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: math-ph