COMMISSION 27 OF THE I.A.U.
              INFORMATION BULLETIN ON VARIABLE STARS
                           Number 1228

                                                    Konkoly Observatory
                                                    Budapest
                                                    1977 January 10


    PHOTOGRAPHIC AND PHOTOELECTRIC OBSERVATIONS OF RZ Oph

RZ Oph is an eclipsing binary with a period of approximately 
262 days. We began following it photographically in 1969  at
the "G. Horn D'Arturo" Observatory. The list below contains the
photodensitometric reductions of the 1969 and 1971 observations.

1969  J.D.        m_ph     m.e.    N
      2440...

      359.500     10.85      --    1
      363.488     10.98  +-0.09    4
      368.509     12.50     .07    2
      372.505     12.63     .04    2
      373.463     12.70     .07    2
      380.488     10.88     .04    2

1971  J.D.         m_ph   m.e.     N
      2441...

      149.434     11.15      --    1
      153.403     12.68  +-0.10    2
      157.406     12.55      --    1
      159.409     12.60     .00    2
      160.422     12.53     .04    2
      162.468     11.15      --    1
      163.471     11.10     .07    2
      164.492     11.08     .18    2

   Column "m_ph" contains photographic magnitudes, "m.e." the
mean errors and "N" the number of plates. The material used is
Ilford Zenith Astronomical with 10 minutes exposure.
   During 1976 RZ Oph has been observed photoelectrically
with the 400 mm diam., f=200 cm Newtonian reflector of our observatory
The magnitude differences DeltaV near the minimum are in UBV system.

1976    J.D.        m_ph      m.e.      N
        2442..

        982.4150   - 0.21  +- 0.03      3
        984.3706   - 0.04      .01      8
        984.4294     0.00      .00      4
        987.4076   + 0.40      .01      3
        989.3989   + 0.39      .01      3
        993.3774   + 0.40      .00      5
        994.3888   + 0.38      .01      4

   Column "m.e." reports the mean errors and column "N" the
number of observations. The star BD +6deg3928 (CI) has been used
as comparison star.


                 L. BALDINELLI, S. GHEDINI

               "G. Horn D'Arturo" Observatory
              Montebello 4, 40121 Bologna, Italy