BC UMa superhump evolution Dear Colleagues, The rare superoutburst of BC UMa continues. Superhumps still prominently exist, apparently associated with the apperance of secondary superhumps. The timing analysis of obtained superhump maxima has yielded a remarkably small O-C's to the constant period. The merginally negative period derivative is almist an order smaller than those of typical SU UMa-type dwarf novae. Such a small period change (if not the period increase in some very rare systems) is one of recently established characteristics of SU UMa-type dwarf novae with low outburst frequency and large outburst amplitudes. Continued observation of the present rare superoutburst is highly encouraged. Regards, Makoto Uemura, Taichi Kato, Sergei Shugarov, Elena Pavlenko, Patrick Schmeer, Nick James, Rudolf Novak, Gianluca Masi On behalf of the VSNET collaboration team