Occultation of 4UC 540-011040 by (509) Iolanda on 2018-09-11 Green O+: O. Schreurs et al Optics: M406 | Method: VID | Duration: 3.84 5.44,50.52,0 Green O+: Roland Boninsegna Optics: M406 | Method: VID | Duration: 2.52 4.58,50.09,0