COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                       NUMBER 683

                                          Konkoly Observatory
                                          Budapest
                                          1972 May 29


      NEW VARIABLE STAR IN THE OPEN CLUSTER NGC 7128


The star No. 5 of the Hoag etal. (1961, Publ. Naval Obs. Vol. XVII, Part VII.)
catalogue located exactly in the centre of the open cluster NGC 7128 has been
found as variable during photographic observations of the Nova Cephei 1971
between July 18, 1971 and April 20, 1972 with the Schmidt camera (80/120, f=240
cm) of Hamburg Observatory. This star, denoted in our list as HBV 478,
RA=21h42m13.88s, D=+53deg29'32.2" (1950, Cygnus) was measured on 18 plates
in the V (Kodak 103a-D+GG11) and B (Kodak IIa-O+GG13) international system,
giving the following results:

JD_hel         V        B        JD_hel         V       B

2441151.489   12.57m   -         2441207.46   12.14   12.99
   1172.380   12.34    -            1240.36   12.13   13.07
   1181.508   -        12.98m       1266.27   12.35   13.17
   1183.427   12.43    -            1331.26   12.36   13.06
   1183.513   -        13.00        1394.62   12.60   13.43
   1187.487   12.53    -            1428.58   12.26   12.86

Mean V=12.37, B=13.07

The mean deviation of one measurement, +-0.17m both in V and B, is about three
times larger than the corresponding measuring errors, which strongly supports
the variability of that star. The amplitude of about 0.5 mag. in both colours
could be suspected. Our mean V and B values are in close agreement with those
given by Hoag et al., V=12.35, B-V=+0.78, U-B=0.00.

The determination of the type of variability and further studies of this star
could be very useful because of the fact that HBV 478=7128-5 is an
early-type star (B2V - Hoag, Applequist 1965, ApJ Suppl. No. 107, 215) and a
physical member of the cluster.


Hamburg-Bergedorf Observatory
18 May, 1972

                                          L. KOHOUTEK