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[vsnet-obs 9727] Discrepancy in DU Cyg observations

Discrepancy in DU Cyg observations

    I have noted discrepancies in DU Cyg data.  Some observers report
significant brightening, while some do not.  Observations more agreed
between observers in previous maxima.  What would be the cause?

  YYMMDD(UT)   mag  observer
  971130.397   130  (M. Hiraga)
  971130.512   128  (H. Itoh)
  971204.428   128  (M. Hiraga)
  971204.501   125  (T. Watanabe)
  971205.769   124  (G. Comello)
  971210.800   128  (D. Van Hessche)
  971216.760   122  (G. Comello)
  971218.391   120  (M. Hiraga)
  971225.392   117  (M. Hiraga)
  971227.469   117  (T. Watanabe)
  971231.406   114  (M. Hiraga)
  980105.430   115  (T. Watanabe)
  980109.730   129  (G. Comello)
  980116.403   113  (M. Hiraga)
  980122.740   127  (G. Comello)
  980125.399   115  (T. Watanabe)
  980129.414   111  (M. Hiraga)
  980201.740   128  (G. Comello)

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