COMMISSION 27 OF THE I. A. U.
             INFORMATION BULLETIN ON VARIABLE STARS
                          NUMBER 82

                                         Konkoly Observatory
                                         Budapest
                                         17 February 1965

 
                GALAXIES WITH FREQUENT APPEARANCE
                         OF SUPERNOVAE

    In the following table seven galaxies in which two or more
supernovae have been appeared are given. The consecutive columns
contain the NGC number, the type and the absolute magnitude of the
galaxies, the number of supernova-appearances, the time interval in
years between the first and the last appearance of a supernova, and
finally the type of the supernova according to F. Zwicky's 
classification.

 NGC           Type     M      n       t    SN
3184            Sc    -19m.1   3      16     -
3938            Sc    -19.3    2       3    II
4157            Sc    -19.1    2      18    II
4303            SBc   -19.8    3      38 I,III
4321            Sc    -19.7    3      58     I
5236            Sc    -19.6    3      34     V
6946            Sc    -19.6    3      31    II

    It is evident that all these galaxies are giants of class Sc (SBc).
Practically, supernovae of all types appear in these galaxies. The mean
frequency of supernova-appearances in these galaxies is one per
15 years. Supernova of type I have the frequency approximately one
per 35 years. That is about 20 times greater than usually adopted:
    It seems extremely desirable to observe the giant galaxies of
class Sc (SBc) systematically.
    A more detailed paper is to be published in the 
"Astrophysics" (USSR).

Sternberg Astronomical Institute
Moscow, 6 February 1965               B. V. KUKARKIN