The interactive map below shows our current prediction for the stellar occultation by (21900) Orus on 2021 October 16 UT. The prediction is based on a Gaia DR2 position for the star, corrected for parallax and proper motion, and the v20200901194057 orbit estimate for Orus, which has a 1-sigma cross-track uncertainty of 10.6 km.
Geocentric mid-time of the event is 01:55:29 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 51 km, so central chords are expected to last 3.2 seconds.