The interactive map below shows our current prediction for the stellar occulation by (21900) Orus on 2019 November 4 UT. The prediction is based on a Gaia DR2 position for the star and the v20181128183246 orbit estimate for Orus.
Geocentric mid-time of the event is 13:36:06 UT. Star position is RA 21:11:11.6, Dec -07:31:59 (J2000), and its magnitude is 13.12. Orus is moving at 10 km/s with respect to the star and its diameter is estimated to be 62 km, so central chords are expected to last 6.2 seconds.