COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                       Number 930

                                   Konkoly Observatory
                                   Budapest
                                   1974 October 4


  THREE PHOTO-ELECTRIC MINIMA OF THE ECLIPSING VARIABLE RZ Cas

   Three photo-electric minima have been obtained photo-electrically
at the Leiden Observatory of the eclipsing variable star RZ Cas. This
star shows a variability in its period. The observations were made
in the nights of December 23/24, 1962, February 28/March 1, 1963 and
July 31/August 1, 1963, in yellow light with the 45-cm Zunderman 
reflector. A yellow filter Corning 3384 was used, with an effective
wavelength of 5390 A. The comparison star was BD +69deg 180. The magnitude 
differences were derived in three decimals. The time was measured 
in seconds and has been computed in five decimals of a Heliocentric 
Julian Day. The time of minimum and its mean error were computed 
with the method of Hertzsprung, as revised and described by Kwee
and Van Woerden (BAN 12, 327, 1956). The resulting epochs are:

           J.D. Hel.  2438022.49446 +- .00006 m.e.
                      2438089.42796 +- .00017 m.e.
                      2438242.41899 +- .00020 m.e.



                                            A.G. JANSEN
                                            Leiden Observatory
                                            Wassenaarseweg 78
                                            Leiden 2405,
                                            Holland.