COMMISSION 27 OF THE I. A. U.
           INFORMATION BULLETIN ON VARIABLE STARS
                        NUMBER 23

 
                                     Konkoly Observatory
                                     Budapest
                                     18 April 1963

           ON THE LIGHT VARIABILITY OF THE OBJECT
          IDENTIFIED WITH THE RADIO SOURCE 3 C-273

      Examination of 44 plates of the Sternberg Astronomical
Institute at Moscow obtained during 1896-1960 and also of the Wolf-Palisa 
and Palomar charts shows that the star-like object identified
with the radio-source 3 C-273^+ is variable within the limits 12m.0-
12m.7 (pg). Most of the plates were measured by means of an iris-
photometer.
 Also plates obtained during April-June show the possibility
of smaller light variations with amplitudes of 0m.2-0m.3 and lasting a
few days.


                      [FIGURE 1]


a 12m.29 pg
b 12.56
c 12.81
d 13.04
e 13.75



9 April 1963                           A. S. SHAROV
                                      Yu. N. EFREMOV
                           Sternberg Astronomical Institute

+ M. Schmidt, Nature 197, 1040, 1963. [BIBCODE 1963Natur.197.1040S ]