COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                       Number 1041

                                 Konkoly Observatory
                                 Budapest
                                 1975 September 2


            HD 173198, A beta LYRAE TYPE STAR


   Photoelectric observations have been made of the star
HD 173198 (8.1 mag, B1V). As a comparison star was taken the
star AGK -1d2247 (8.5 mag, B5). The star HD 173198 is mentioned 
in volume III of the third edition of Kukarkin's General
Catalogue of Variable Stars, with the 1900 coordinates:
alpha=18h39m02s; delta=-1d38.5'.
   The observations were made with the Walraven simultaneous
five-colour photometer (Walraven and Walraven, 1960 Bull.Astron.
Inst.Netherl. 15, 67; Rijf, Tinbergen and Walraven, 1969 Bull.
Astron.Inst.Netherl. 20, 279) attached to the 90 cm light-collector 
of the Leiden Southern Station at the SAAO annex in South
Africa, from June 16, 1975 to August 10, 1975. The observations
will be continued until the second week of September.
   A preliminary reduction from the data of 21 nights showed
that HD 173198 is a B Lyrae type star, with a period of 1.363d+-
+- 0.001 e.e.. The primary minimum is 0.318 mag. deep.
   The figure shows the log intensity relative to the comparison 
star for the Walraven B band (4260 A). The phases have been
computed with the formula:

            (JD -2442610.070) x 1.363^-1

   It is a pleasure to thank Dr. A.M. van Genderen for his
advices and for handing me over some observing time.




                           F. van LEEUWEN
                     Sterrewacht, Huygenslaboratorium,
                     Wassenaarseweg 78, Leiden 2405,
                     Nederland.


                           [FIGURE 1]