COMMISSION 27 OF THE I. A. U.
     INFORMATION BULLETIN ON VARIABLE STARS
                 NUMBER 209

                           Konkoly Observatory
                           Budapest
                           12 July 1967


   THE PERIOD OF i BOO IN THE LAST THREE YEARS


As a part of the photoelectric photometry of eclipsing binaries at the Nurnberg
Observatory we obtained in the years 1964 to 1967 15 minima of the W UMa
variable i Bootis. From these observations I derived 4 normal-minima given in
the Table below. The O-C's against the elements in SAC 38 (I) are positive and
increasing slowly. Using the method of least squares I derived the new
elements (II). The period is in good agreement with that given by H.
Schneller in AN 288, 183 for the time after 1960 (0.^d26781417). The period of
i Boo seems to have been constant for the last eight years.

Min.: J.D. 2437365.5641+0.^d267813*E            (I)
Min.: J.D. 2438513.4166+0.^d2678143*E           (II)

Minima          O-C (I)     O-C (II)
2438513.4165   +0.^d0059   -0.^d0001
    882.4663   +0.0094     +0.0016
   9261.4198   +0.0075     -0.0021
    671.4470   +0.0130     +0.0014


Nurnberg Observatory,

E. POHL
85 Nurnberg, Lutzowstr. 10
Western Germany