Occultation of 4UC 450-090408 by (15527) 1999 YY2 on 2018-04-21 Red O-: Karel Halir Optics: M507 | Method: VID | Duration: 13.60,49.75,0 Red O-: Bjoern Kattentidt Optics: M279 | Method: VID | Duration: 12.22,48.99,0 Red O-: Robert Greimel Optics: M500 | Method: VID | Duration: 15.49,47.07,0 Red O-: Pietro Baruffetti Optics: M200 | Method: VID | Duration: 10.13,44.02,0 Red O-: E. Frappa/A. Klotz Optics: M250 | Method: CCD | Duration: 6.92,43.75,0 Red O-: Alfonso Noschese Optics: M300 | Method: VID | Duration: 14.90,40.66,0