Occultation of 4UC 550-012450 by (140) Siwa on 2019-11-18 Green O+: Nikolai Wuensche Optics: M300 | Method: CCD | Duration: 7.05 13.66,52.76,0 Green O+: Christian Weber Optics: M150 | Method: VID | Duration: 7.91 13.43,52.52,0 Green O+: Peter Enskonatus Optics: M200 | Method: VID | Duration: 7.41 13.72,52.43,0 Green O+: Christophe Ratinaud Optics: M250 | Method: VID | Duration: 7.74 -2.54,48.43,0