Occultation of 4UC 439-104221 by (256) Walpurga on 2017-07-16 Green O+: Karel Halir Optics: M507 | Method: VID | Duration: 5.68 13.60,49.75,0 Red O-: Bjoern Kattentidt Optics: M279 | Method: VID | Duration: 12.22,48.99,0