Occultation of 4UC 553-031781 by (971) Alsatia on 2020-10-24 Green O+: Roland Boninsegna Optics: M400 | Method: VID | Duration: 7.68 4.58,50.09,0 Green O+: Faustino Garcia Optics: M250 | Method: CCD | Duration: 8.25 -6.39,43.47,0 Red O-: Jean Bourgeois Optics: M356 | Method: VID | Duration: 5.04,50.09,0