COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                       Number 978

                                     Konkoly Observatory
                                     Budapest
                                     1975 March 20


               REVISED ELEMENTS OF ECLIPSING STARS

V787 Cygni:    Min.= J.D. 241 6457.424 + 1d.5285151.E
               Observations from 1904 to 1973, period constant.
RV Piscium:    Min.I = J.D. 242 4381.480 +0d.55399145.E
               Min.II= J.D. 242 4381.757
               Observations from 1925 to 1973, period constant.
XZ Ursae Maioris:Min.= J.D. 244 0725.476 + 1d.2223092.E
               Observations from 1899 to 1974, period nearly constant.
BE Vulpeculae: Mean elements
               Min. = J.D. 242 6144.489 + 1d.5520487.E
               Instantaneous elements
           (1) Min. = J.D. 242 6144.490 + 1d.552050.E
           (2) Min. = J.D. 243 0698.203 + 1.5520442.E
           (3) Min. = J.D. 243 5340.373 + 1.552052.E
           (4) Min. = J.D. 244 0111.381 + 1.552044.E
               Observations from 1930 to 1974, period insignificantly
               variable.


                                       PAUL AHNERT
                                  Sonneberg Observatory




            PHOTOGRAPHIC MINIMA OF ECLIPSING STARS

BX And     Min.= J.D. 244 2369.411, O-C   = -0d.001     n=12
WW Cnc                    2152.379, O-C   = -0.003      n=10
ZZ Cyg                    1987.401, O-C   = -0.011      n= 8
                                    O-C_A =  0.000  1)
V787 Cyg                  1922.487, O-C   = +0.042      n=13
                                    O-C_A = +0.001  2)
                          1948.468, O-C   = +0.038      n=15
                                    O-C_A = -0.002  2)
TZ Dra                    2184.450, O-C   = +0.007      n=12
UV Leo                    2450.495, O-C   = +0.009      n=12
                                    O-C   = +0.001  3)
U Peg                     2359.398, O-C   = +0.007      n=12
DI Peg                    1983.349, O-C   = -0.008      n=14
                                    O-C_A =  0.000  4)
RV Psc                    1988.433, O-C   = -0.015      n= 8
                                    O-C   = -0.003  2)
BU Vul                    1960.471, O-C   = +0.007      n= 9

C has been computed with the elements from  Rocznik (Krakow),
C_A were computed with the elements of the author: 1) MVS vol. 6, p. 67,
2) unpubl., 3) MVS vol. 6, p.100, 4) MVS vol. 6, p. 158.

                                         PAUL AHNERT
                                    Sonneberg Observatory