COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                      Number 2883


                                         Konkoly Observatory
                                         Budapest
                                         18 March 1986

                                         HU ISSN 0374 - 0676



            CORRECT PERIOD OF THE MIRA STAR BV CYGNI


  By evaluating 465 Sonneberg Sky Patrol plates taken by H. Huth I found
that the period given in the literature (see GCVS Moscow, 1985) was not
correct. The following improved elements have been derived:

        Max. = 2445559 + 254.3d E

  Table I shows the degree of fitting by these elements of the observed
maxima.

                 Table I

   Max.     E     O-C     Remarks

2438179   - 29   -  5d    1,2
   8708   - 27   + 15     1,2
   9205   - 25   +  3     1,2
   9440   - 24   - 16     1,2
2440480   - 20   +  7     2
   0740   - 19   + 13     2
   1240   - 17   +  4     2
   2513   - 12   +  6     1,2
   2742   - 11   - 20     1,2
   3008   - 10   -  8     2
   3790   -  7   + 11     1,2
   5558      0   -  1
   6330      3   +  8     3



 Remarks: 1 single bright observation
       2 observation on ORWO RP1 + filter GG14
       3 observation on ORWO ZU21
   Visual estimations of the AFOEV of 1983 and 1984 are not in contradiction
 to our results.



                              E. SPLITTGERBER
                            DDR-4020 Halle
                            Otto-Winzer-Strasse 41/30





                          ERRATUM


   In Table I of the IBVS No. 2870, "Variation of the CP2 star BD+24deg3675",
the amplitude in U-filter is erroneously given: instead of 0.152 one should
read 0.304.



                            H. SCHNEIDER