DV UMa superoutburst UGSU+E YYYYMMDD(UT) mag observer 20191122.7731 <166c (Yutaka Maeda) 20191128.716 <155 (Hiroyuki Maehara) 20191208.7433 143cG (Yutaka Maeda) 20191209.7432 150c (Yutaka Maeda) 20191210.7616 142c (Yutaka Maeda)