COMMISSION 27 OF THE I. A. U.
           INFORMATION BULLETIN ON VARIABLE STARS
                       Number 2598

                                            Konkoly Observatory
                                            Budapest
                                            3 October 1984

                                            HU ISSN 0374 - 0676

              ON THE SUPPOSED PERIODICITY OF IP PERSEI

  99 Sonneberg photoelectric observations in the V band of IP Persei, in
general classified as an Isa star, show no signs of the 1.94672 day periodicity
suggested by Kardopolov and Filip'yev in 1981 in Perem. Zvezdy 21, p.688
(1982), which unfortunately arrived at our library not before August 1984.
  Our observations were discussed already in Mitt. Veranderl. Sterne 8,p.53
(1978); they were obtained mainly in the years 1968 to 1976. It cannot be
completely excluded, although it seems to me not plausible, that the 
"eclipsing" variability is restricted to some episodic time interval(s).


                              [FIGURE 1]


   The figure shows our V data folded by the mentioned "period". The four
arrows indicate observations which are much fainter than the limitations of
the drawing. Their clustering and spacing by half of the period is meaningless 
and is caused by the 1.0 or 2.0-day intervals between the measurements
in connection with the assumed length (approx. 2 days) of the period. These
arrowed observations form the minimum depicted in Mitt. Veranderl. Sterne 8,
p. 55 (fig. 2).


                                   W. WENZEL
                              Sternwarte Sonneberg
                         Zentralinstitut fur Astrophysik
                         Akademie der Wissenschaften der
                                       DDR