Occultation of UCAC4 509-143047 by (1031) Arctica on 2026-08-31 Red O-: Piotr Walczak Optics: M130 | Method: VID | Duration: 19.40,51.77,0 Red O-: Matthieu Conjat Optics: T400 | Method: VID | Duration: 7.30,43.73,0