Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gaia, Trumpler 16, and Eta Carinae   Gaia parallaxes for the star cluster Tr 16 reveal a discrepancy in the
oft-quoted distance of Eta Carinae. It is probably more distant and more
luminous. Moreover, many presumed members may not belong to Tr 16.

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The categories of this paper are: chem-ph
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The categories of this paper are: hep-th
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The categories of this paper are: q-alg
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The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
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The categories of this paper are: plasm-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph