Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: KIC 8462852: Maria Mitchell Observatory Photographic Photometry 1922 to
  1991   A new study of the long-term photometric behavior of the the unusual star KIC
8462852 (Boyajian's Star) has been carried out using archival photographic
plates from 1922-1991 taken at the Maria Mitchell Observatory (MMO). We find
five episodes of sudden, several day, decreases in magnitude occurring in 1935,
1966, 1978, and two in 1980. Episodes of sudden increase in magnitude appear to
occur in 1967 and 1977. Inspection of archival light curves of KIC 8462852 from
two previous studies based on the Harvard and the Sonneberg plate collections
finds apparent corresponding events to these observed episodes in the MMO light
curve. Also, a general trend of $0.12\pm0.02$ magnitudes per century decrease
is observed in the MMO light curve, significant, but less than the trend of
0.164$\pm$0.013 observed in the Harvard light curve.

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The categories of this paper are: physics
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ph
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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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: patt-sol
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The categories of this paper are: math
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The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con
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The categories of this paper are: econ
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The categories of this paper are: atom-ph
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The categories of this paper are: cs