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

                     Number 1003

                                   Konkoly Observatory
                                   Budapest
                                   1975 May 28


       IMPROVED PERIOD OF THE Ap VARIABLE HR 5153


    HR 5153 (=HD 119 213) is a Sr-Cr-Eu peculiar star of spectral 
type A1p which has been found photometrically variable in
B and U lights by E.W. Burke and J.T. Howard (Ap.J. 178, 491,
1972). They derived the period of light variation P= 1.706 +- 0.001
days. The star was recently observed at Shemakha Observatory and
also at Mauna Kea Observatory. The observations at Shemakha were
made in ten colours during the summer 1974 (W. Schoneich et al.,
private communication). Hawaiian measurements (S.C. Wolff, N.D.
Morrison: P.A.S.P., in press, 1975) were done in ubvy system during 
the spring 1973. From their data Schoneich et al. found the
period P = 2.433 days, while Wolff and Morrison obtained P= 2.451
+- 0.010 days.
    I have reexamined all sets of available photometric data.
It turns out that the period suggested by Burke and Howard is 
definitely spurious. By combining the three sets of observations and
accepting Wolff's and Morrison's basic epoch (maximum light in v
colour) I have found the improved period:

      JD_hel (v_max) = 2 441 450.74 + 2.45002d E
                                         +-18



                         ZDENEK MIKULASEK
                      N. Copernicus Observatory
                         and Planetarium
                          616 00 Brno,
                         Czechoslovakia