COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 341


                               Konkoly Observatory
                               Budapest
                               1969 April 3


        MAXIMA OF CY AQUARII IN 1964 AND 1968
               PERIOD DETERMINATION


      Two maxima determined from light curves in 1964,
and four in 1968, were used to establish a combined value
of period for CY Aquarii (RA = 22h38m; D = 1deg20'N, 1960).
      Observations were made through a wedge photometer
attached to the 12 1/2 inch (32 cm) refractor of the 
Observatorio Nacional do Rio de Janeiro in the visual range.
     Deltam values were obtained from direct comparison
between star Delta(RA) = -0.5 min, DeltaD = +0deg5) and the variable,
controlled by medium values of absorption when necessary.
      The results are shown below, and are reliable
within +/- 1.5 min.

          J.D. hel. 2 438 728.459 (1964)
                          729.439
                     2 440134.481 (1968)
                          134.542
                          137.472
                          158.455

      Period as determined from a multiple combination of
times above gives us (0.061 038 44d +/- 3 s.d.) over more than
23 000 cycles.
      Moreover we derived the times of critical point
(maximum slope) in the rising branch of light curves and
compared them - as phase - with later determinations as
suggested by R. Zissel, in Astroph. J. no. 1363.
      Results presented good agreement.
 

Rio de Janeiro, Observatorio Nacional
          Brasil

1969/MAR/10
JBJ/fbs.                                  J. BARROSO, Jr.