Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the correctness of orbital solutions obtained from a small set of
  points. Orbit of HIP 53731   HIP 53731 is a binary consisting of stars of the spectral types K0 and K9.
Orbit of this object was constructed previously by Cvetkovi'c et al. (2016) and
improved by Tokovinin (2019). It should be noted that there is an 180 degree
ambiguity in the position angles of some published measurements. Speckle
interferometric observations were obtained in 2007-2020 (21 measurements) at
the 6-m telescope of the SAO RAS (BTA) by the authors of this article. The
analysis of new data together with previously published ones made it possible
to construct the accurate orbit of HIP 53731 and to halve the already known
values of the orbital period of the system. As a result of the study, the mass
sum, the masses of each component and their spectral types were determined by
two independent methods. According to the qualitative classification of orbits,
the orbital solution has grade 2 - "good" (observations cover more than half of
the orbital period and correspond to different phases).

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The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
10
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: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: math-ph
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The categories of this paper are: hep-th
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys