Photoelectric observations of CY Cygni (1959 - 1961).

Summary. A set of 184 photoelectric observations of Y CYGNI is presented, obtained in 1959-1961; the measurements define 4 epochs of minimum. An ensuing short discussion of the period changes indicates that Dugan's formula still represents the apsidal rotation very well and that, further, no light-time effect of any significant amplitude can be found. Contrary to pre vious suggestions based on radial velocity data, the existence of a third body in the system seems rather improbable. Key words: eclipsing binaries - apsidal motion - lighttime effect