Occultation of UCAC4 457-050144 by (3917) Franz Schubert on 2023-04-21 Red O-: Marcin Filipek Optics: M250 | Method: VID | Duration: 19.75,50.21,0 Red O-: Daniel Blazewicz Optics: M350 | Method: CCD | Duration: 20.32,49.99,0