LX Cnc superoutburst YYYYMMDD(UT) mag observer 20190330.5502 137cG (Yutaka Maeda) 20190331.8528 138 (Eddy Muyllaert) 20190401.5894 138cG (Yutaka Maeda) 20190401.8528 139 (Eddy Muyllaert)