COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     Number 922

                                  Konkoly Observatory
                                  Budapest
                                  1974 September 6


       EPOCHS OF MINIMUM LIGHT, AK HERCULIS

   R and I light curves of AK Herculis, a W Ursae Majoris
system which undergoes complete eclipses, with secondary
minimum being total, were observed photoelectrically in 1969.
The Johnson UBVRI dual channel photometer, housing an RCA 7102
photomultiplier for use with the R and I filters, was attached
to the 28-inch telescope of the Catalina Observatory of the
University of Arizona. Two primary and three secondary eclipse
curves are defined by the observations. The Hertzsprung (B.A.N.
4, 179, 1928) method was used to determine the epochs of minimum
light listed in Table I; arid the O-C's (I) and (II) were computed
from the ephemerides given by Woodward (Harvard Obs. Circ. No. 446,
11, 1942) and Bookmyer (P.A.S.P. 84, 566, 1972), respectively.

                         TABLE I

         JD Hel.    Min.   O-C (I)    O-C (II)
         2440300+

         87.8211     I    +0.0195    -0.0012
         94.7765     II   +0.0198    -0.0010
         95.8297     I    +0.0192    -0.0016
         97.7275     II   +0.0202    -0.0007
         99.8341     II   +0.0191    -0.0017

    The light curves and an analysis of the observations will
be published separately.

    Michael Prost assisted with the observations.


August 26, 1974                          BEVERLY B. BOOKMYER

                                   Clemson University
                                   Clemson, South Carolina 29631
                                   U. S. A.