Occultation of UCAC4 558-018608 by (4138) Kalchas on 2023-04-08 Green O+: Anna Marciniak Optics: M350 | Method: CCD | Duration: 1.37 16.04,52.60,0 Green O+: Anna Marciniak Optics: M400 | Method: CCD | Duration: 1.10 17.08,52.28,0