COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 2363

                                    Konkoly Observatory
                                    Budapest
                                    30 June 1983

                                    HU ISSN 0374-0676


        OBSERVATIONS OF AT Cnc IN THE YEARS 1982 AND 1983




  The star which is probably of cataclysmic type (Meinunger, 1981) was 
inspected on 18 blue-sensitive plates (ORWO-ZU 21 + GG13 + BG12) obtained with
the Schmidt camera 50/70/172 cm of Sonneberg Observatory covering the time
intervals between 1982 April 14 and April 26 and 1983 February 15 and March
13. These observations are listed in Table I. The light curve of the star
which shows variations over the whole amplitude between m_B=12.6 and m_B=15.9
is given in Figure 1.

                            [FIGURE 1]

              Table I
-----------------------------------
J.D. 244.... m_B   J.D. 244... m_B
-----------------------------------
5074.352    15.83   5384.421  15.80
5077.363    15.67   5384.475  15.93
5080.351    12.66   5397.338  12.59
5082.356    12.79   5397.365  12.59
5086.352    15.39   5402.404  15.39
5381.407    15.53   5403.380  15.80
5381.436    15.53   5403.408  15.74
5383.392    15.93   5406.333  15.25
5383.531    15.80   5407.331  12.79
-----------------------------------

 The sequence of comparison stars in B is shown in the finding chart
of Figure 2.

                      [FIGURE 2]

             Table II
-----------------------------------
Comp. star  m_B   Comp. star  m_B
-----------------------------------
a          12.25     e       14.97
b          12.93     f       15.67
c          13.62     g       16.45
d          14.30
-----------------------------------

    The magnitudes of these stars which include those given by Romano, and
Perissinotto (Romano, Perissinotto, 1968) were obtained on 2 plates by linking 
to the UBV sequence of the Praesepe cluster and are given in Table II.


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

References:

Meinunger, L., 1981, Mitt. Verand. Sterne Sonneberg 9, p. 59 [BIBCODE 1981MitVS...9...59M ]
Romano, G., Perissinotto, M., 1968, Padova Publ. 151, p. 9