Occultation of 4UC 420-143945 by (21900) Orus on 2019-09-07 Green O+: A. Malvache et al Optics: V112 | Method: CCD | Duration: 4.00 57.17,23.89,0 Red O-: Alexis Martin Optics: V112 | Method: CCD | Duration: 57.57,23.80,0