Data sources:

DB: D.Buczynski, CBAT 2018.
DPV: P.A.Dubovsky, VSNET alert#22132, 2018.
KC: R.Konyves-Toth, B.Csak, A.Pal, J.Vinko, ATel#11594, 2018.
Ki: S.Kiyota, CBAT, 2018.
MGH: M.Mugrauer, H.Gilbert, S.Hoffmann, ATel#11517, 2018.
Na: Y.Nakamura, CBAT, Discovery, 2018.
SO: V.P.Goranskij with the SAO 1 m Zeiss Telescope and UBVRcIc photometer based on CCD EEV42-40.