Occultation of 4UC 494-039484 by (2400) Derevskaya on 2021-12-26 Green O+: Christian Weber Optics: M203 | Method: VID | Duration: 1.04 13.43,52.52,0 Red O-: Anna Marciniak Optics: M350 | Method: CCD | Duration: 16.04,52.60,0 Red O-: Sven Andersson Optics: M355 | Method: CCD | Duration: 13.66,52.41,0