Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: IAU MDC Meteor Orbits Database -- A Sample of Radio-Meteor Data from the
  Hissar Observatory   We announce an upgrade of the IAU MDC photographic and video meteor orbits
database. A sample of 8916 radio-meteor data determined by the radar
observations at the Hissar (Gissar) Astronomical Observatory, Dushanbe,
Tajikistan, are added to the database. Along with the radiant coordinates,
velocities, and orbital elements the Hissar radio-meteor sample contains the
heights, linear electron densities, stellar magnitudes, and masses of the
meteoroids. The new 2018 version of the IAU MDC database contains 4873
photographic, 110521 video, and 8916 radio meteor records. The data are freely
available on the website at the address
https://www.astro.sk/~ne/IAUMDC/PhVR2018/ .

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The categories of this paper are: ao-sci
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The categories of this paper are: cs
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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: physics
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The categories of this paper are: chao-dyn
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The categories of this paper are: math
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: cond-mat
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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys