Occultation of TYC 1887-00862-1 by (257) Silesia on 1999-12-22 Green O+: Francois Colas Optics: M200 | Method: VIS | Duration: 6.60 3.15,43.91,0 Green O+: Jean Lecacheux Optics: B80 | Method: VIS | Duration: 5.98 3.56,43.84,0 Green O+: Pierre Jonquet Optics: M280 | Method: VIS | Duration: 3.87,43.61,0 Red O-: Jean Montanne Optics: M200 | Method: CCD | Duration: -0.65,44.82,0