V418 Ser outburst (EI Psc-type object) YYYYMMDD(UT) mag observer 20180615.5935 <163C (Masayuki Moriyama) 20180616.6166 <142c (Yutaka Maeda) 20180621.6018 <157c (Yutaka Maeda) 20180624.5969 152C (Masayuki Moriyama)