Occultation of 4UC 522-050421 by (2731) Cucula on 2021-05-25 Green O+: Michal Rottenborn Optics: M254 | Method: CCD | Duration: 4.00 14.11,49.99,0 Red O-: Karel Halir Optics: M507 | Method: VID | Duration: 13.60,49.75,0