HS Vir possible superoutburst YYYYMMDD(UT) mag observer 20180322.6315 158c (Yutaka Maeda) 20180323.6407 <153c (Yutaka Maeda) 20180323.724 <153 (Hiroyuki Maehara) 20180324.6445 <146c (Yutaka Maeda) 20180325.6327 <153c (Yutaka Maeda) 20180327.6366 149c (Yutaka Maeda) 20180328.5894 134c (Yutaka Maeda)