SU UMa is probably undergoing a superoutburst. YYYYMMDD(UT) mag observer 20100113.735 <134 (Hiroyuki Maehara) 20100114.831 <141 (Jose Ripero) 20100116.749 <131 (Hiroyuki Maehara) 20100117.742 147 (Gary Poyner) 20100120.833 114 (Jose Ripero) 20100120.969 113 (Jose Ripero)