V1504 Cyg superoutburst The SU UMa-type dwarf nova V1504 Cyg is undergoing a superoutburst. The latest superoutburst was observed in 1999 June-July. Follow-up observations are encouraged. YYMMDD(UT) mag observer 991017.905 <150 (G. Poyner) 991019.772 <142 (E. Muyllaert) 991019.867 <150 (G. Poyner) 991024.765 <145 (E. Muyllaert) 991026.755 <137 (E. Muyllaert) 991027.740 150 (T. Kinnunen) 991027.760 147: (E. Muyllaert) 991029.690 138 (T. Kinnunen) 991029.747 138 (E. Muyllaert)