ASASSN-17fo possible superoutburst (UGSU+E) YYYYMMDD(UT) mag observer 20230510.3665 <17.776g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230510.5396 <142c (Yutaka Maeda) 20230511.5475 <159c (Yutaka Maeda) 20230511.6453 <172C (Masayuki Moriyama) 20230513.5734 16.76C (Masayuki Moriyama) 20230514.3727 16.909g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))