| Abstract: | In this paper the search for optical identifications in the 5C-radio surveys is continued. Near the positions of 135 radio sources of the 5C3 catalogue all present optical objects up to the plate limit (about B ≈? 21) have been measured photometrically in UBVr and astrometrically on plates of the 134/200 cm Schmidt telescope of the Karl Schwarzschild Observatory Tautenburg. A total of 111 candidates for possible optical identifications were found. The number of real identifications will be, of course, much smaller. Among the 111 objects there are: 12 supposed QSO's, 21 galaxies or probable galaxies, 56 stellar objects the greater part of which may be main sequence stars, subdwarfs and white dwarfs, and I object may be the centre of an H II region in the OB-association OB 182. 21 objects near the plate limit could not be classified. A statistical treatment with information on the real rate of identification (it roughly will amount to about 10%) and its reliability will be given in part III. |
