COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                    Number 1187

                              Konkoly Observatory
                              Budapest
                              1976 October 13



        ECLIPSE TIMINGS OF CATACLYSMIC VARIABLES



   The following heliocentric times of eclipse of the cataclysmic 
variable U Gem and the similar but non eruptive variable
UX UMa have been obtained from observations made at Kitt Peak
National Observatory.

U Gem                            Eclipse Depth Eclipse Width

Color         HJD        (O-C)   (mag)      (day)

Red      2442789.8040   0.0076   0.38      0.0115
Blue     2442789.8042   0.0078   0.34      0.0106
Red      2442880.7336   0.0075   -         0.0114
Blue     2442880.7338   0.0077   -         0.0116

Eclipse parameters are those given by Krzeminski (Ap.J. 142,
1051, 1965). Colors are as described by Arnold, Berg and Duthie
(Ap.J. 206, 790, 1976).

UX UMa

Color    Min.Light HJD           (O - C)

white    2442420.9944            -0.0014
white    2442541.7505            -0.0014
white    2442791.9174            -0.0004
white    2442792.9003            -0.0009

   (O-C) values are with respect to the elements given by
Mandel (Perem. Zvezdy  15, 474, 1965) and lend support to his
29.02 year periodicity of the (O-C) residuals.




                            S. ARNOLD
                            R. A. BERG
                            J.G. DUTHIE

                      Department of Physics and Astronomy,
                      University of Rochester,
                      NY 14627, U.S.A.