Ten days after its normal outburst the SU UMa-type dwarf nova AK Cnc is now probably undergoing a superoutburst. Available observations (all but two compiled by Taichi Kato): YYMMDD(UT) mag observer 990303.999 <145 (G. Poyner) 990309.982 <134 (H. McGee) 990310.907 <153 (G. Poyner) 990311.869 <136 (P. Schmeer) 990313.837 137 (P. Schmeer) 990313.939 134 (G. Poyner) 990313.983 135 (G. Poyner) 990314.853 138 (E. Muyllaert) 990315.948 <145 (G. Poyner) 990316.438 <15.72V (S. Kiyota) 990316.443 <144 (R. Stubbings) 990316.901 <153 (G. Poyner) 990317.455 <140 (R. Stubbings) 990317.896 <145 (G. Poyner) 990318.847 <140 (E. Muyllaert) 990318.905 <145 (G. Poyner) 990323.471 134 (R. Stubbings) High-speed photometry is strongly recommended. Regards, Patrick