COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                    Number 1335

                                   Konkoly Observatory
                                   Budapest
                                   1977 September 8




            MINIMA OF ECLIPSING VARIABLES



    During February of 1977 the author observed the eclipsing
binaries RZ Cas and W UMa photoelectrically with the 20-inch
reflector at the Urals University Observatory. A yellow filter
was used in the photometer. Visual times of minima have been
observed with a binocular.
    The heliocentric times of the observed minima determined
by the chord bisection method are given in the table, along with
the epoch number E, the O-C values and the number of estimates
n.

Star     Min. hel JD     E             O-C   n   method
         244...                                  of obs.
U Cep    3098.1191d    14123        +0.5896d 31   vis
         3113.083      14129        +0.596    9    "
         3128.041      14135        +0.596   11    "
         3138.012      14139        +0.596    9    "
         3142.998      14141        +0.596    8    "
RZ Cas   2770.0220     21263        -0.0425  18    "
         3101.1078     21540        -0.0414  21    "
         3113.0585     21550        -0.0433  10    "
         3130.9860     21565        -0.0444  15    "
         3136.9627     21570        -0.0444  15    "
         3142.9406     21575        -0.0424  11    "
         3150.1115     21581        -0.0438  19    "
         3193.1370     21617        -0.0466  23    pe
         3234.9729     21652        -0.0445  12   vis
W UMa    3189.2229     63938.5      -0.0091  15    pe
         3219.082      64028        -0.011   14   vis
         3220.083      64031        -0.010   15    "
         3222.083      64037        -0.012   17    "

The O-C values were computed using the elements:

         U Cep Min. hel JD = 2407890.2957d+ 2.4929005d E

        RZ Cas Min. hel JD = 2417355.4233d + 1.1952519d E

         W UMa Min. hel JD = 2421856.9401d + 0.333637665d E.




                              L.P. SURKOVA

                         The Pedagogical Institute
                              Chita, USSR