The interactive map below shows our current prediction for the stellar occultation by (21900) Orus on 2019 November 4 UT. The prediction is based on a Gaia DR2 position for the star and the v20191010151704 orbit estimate for Orus. This orbit includes all astrometry through September 2019.
Geocentric mid-time of the event is 13:36:13 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 51 km, so central chords are expected to last 4.9 seconds. Orus' magnitude is predicted to be 17.5 at event time, so it will be 56 times fainter than the star.