The interactive map below shows our current prediction for the stellar occulation by (21900) Orus on 2021 October 16 UT. The prediction is based on a Gaia DR2 position for the star and the v20181130000504 orbit estimate for Orus.
Geocentric mid-time of the event is 01:54:50 UT. Star position is RA 01:51:53.3, Dec +19:50:28 (J2000), and its magnitude is 11.78. Orus is moving at 16 km/s with respect to the star and its diameter is estimated to be 62 km, so central chords are expected to last 3.9 seconds.