The interactive map below shows our current prediction for the stellar occulation by (21900) Orus on 2020 October 21 UT. The prediction is based on a Gaia DR2 position for the star and the v20190110191822 orbit estimate for Orus.
Geocentric mid-time of the event is 06:14:00 UT. Star position is RA 23:16:36.7, Dec +06:10:54 (J2000), and its magnitude is 16.95. Orus is moving at 11 km/s with respect to the star and its diameter is estimated to be 62 km, so central chords are expected to last 5.6 seconds.