COMMISSION 27 OF THE I. A. U.
           INFORMATION BULLETIN ON VARIABLE STARS
                        Number 2526

                                               Konkoly Observatory
                                               Budapest
                                               28 May 1984

                                               HU ISSN 0374-0676


           OBSERVATIONS OF AT Cnc IN THE SEASON 1983/84

  The star which is probably of cataclysmic type was inspected on 24 blue-
sensitive plates (ORWO-ZU21 + GG13 + BG12) obtained in the B system with the
Schmidt camera 50/70/172 cm of Sonneberg Observatory covering the time interval
between 1983 December 3 and 1984 March 23; the sequence of comparison stars
given in I.B.V.S. No. 2363 was used. These observations are listed in Table I.


                        Table I

J.D.244...      mB      J.D.244...      mB
5672.522        13m00   5680.515        15m83
5672.549        12.79   5683.633        12.79
5672.576        12.79   5684.627        13.34
5672.603        12.66   5750.323        12.66
5672.660        12.66   5752.420        14.57
5673.511        13.21   5761.319        13.07
5673.533        13.34   5763.359        15.25
5673.558        13.34   5779.347        15.98
5674.530        14.57   5780.344        15.11
5674.553        14.16   5781.339        12.52
5676.547        15.98   5782.335        12.66
5679.507       >15.0    5783.331        12.59

  The light curve of the star shows variations over the whole amplitude
between mB = 12.5m and mB = 16.0m. A remarkable increase of brightness with
Delta mB = -3.46m within 1.992d was stated between 1984 March 19 and March 21. 
On the other hand on the series of plates from 1983 December 3 and December 4
only small variations can be seen.


                    W. GOTZ
              Akademie der Wissenschaften
              der DDR, Zentralinstitut fur
              Astrophysik, Sternwarte
              Sonneberg



            CORRIGENDA (to I.B.V.S. No. 2477)

On p.1.  The observed time of Min. II is J.D. 2444679.6663.
     (The J.D. of this minimum is correctly stated in Table I.)

On p.2. Table I. The O-C value given for the last two minima is +0.0097
    and not +0.0079. (These residuals are correctly plotted in Fig.1.)