COMMISSION 27 OF THE I. A. U.
           INFORMATION BULLETIN ON VARIABLE STARS
                       Number 1368

                                     Konkoly Observatory
                                     Budapest
                                     1977 December 7




         PHOTOELECTRIC MINIMA OF U Oph, AB And AND X Tri




       Following are the results of observations made at the Ankara 
   University Observatory with a 30 cm Maksutov telescope, an
   EMI 6256 S photomultiplier tube and standard B, V filters:

U Oph    Hel.Min.J.D.        m.e.   Min.   O-C
       2443319.3964       +-.0004   I     +.0026
            34.4917         .0012   I      .0018
            35.3291         .0005   II     .0005
            40.3622         .0003   II     .0016
            45.3950         .0008   II     .0024
            56.2978         .0005   I      .0024
            61.3304         .0006   I      .0030
            66.3629         .0005   I      .0034

AB And 2443369.3904       +-.0015   I     +.0022
            70.3873         .0004   I      .0035
            71.3827         .0005   I      .0032
            73.3744         .0003   I      .0035
            75.3653         .0002   I      .0031

X Tri  2443379.5316       +-.0020   II    +.0096
            80.5006         .0012   II     .0070
            98.4753         .0006   I      .0085

    SAC 1977 formula Min.I.=J.D. 2436727.424 + 1.6773460d E.
    Quester's formula Min.I.=J.D.2436109.57928+0.33189215 E (IBVS 190)
    and SAC 1977 formula Min.I.=J.D. 2440984.2205+0.9715277 E
    were used, respectively, in the calculations of O-C's.



                            ZEKI TUFEKCIOGLU
                            Ankara University Observatory
                            A.U. Fen Fakultesi
                            Ankara-Turkey