3C 446 is one of the most violently variable quasars.
Its optical variability has been studied for instance by Barbieri et al. (1978), by Pollock et al. (1979) and by Miller (1981). The quasar exibits periods of prolonged activity, with amplitude exceeding 3 mag, and with intraday significant variations. We observed 3C kkG in the last month of Aug. 1983, finding the quasar of unpreceeded brightness.
Three plates were obtained with the 67/92 cm Schmidt telescope on Aug. k, 9 and 11, and in all three the quasar is seen at B=15.1, the brightest value ever recorded. We have only one previous plate of low quality taken on July 31, and 3C kkG is fainter by approximately 0.7 mag. Finally, on two plates taken the 27th of Aug. with the 182 cm telescope at Cima Ekar we see it again down to B=16.2.