Likely superoutburst of CY UMa The SU UMa-type dwarf nova CY UMa may be undergoing a superoutburst. The latest superoutburst of CY UMa occurred in 1997 May. YYMMDD(UT) mag observer 980308.457 <156 (G. Hanson) 980309.180 <136 (P. Schmeer) 980309.832 127 (P. Schmeer) 980309.948 129 (G. Poyner) 980310.017 12.93 (L. T. Jensen, CCD unfiltered) 980310.508 129 (G. Hanson) 980311.844 130 (G. Poyner)