The interactive map below shows our current prediction for the stellar occultation by (21900) Orus on 2020 October 21 UT. The prediction is based on a Gaia DR2 position for the star, corrected for parallax and proper motion, and the v20200831220404 orbit estimate for Orus. The 1-sigma cross-track uncertainty is 11.1 km, which accounts for uncertainties in both the orbit prediction and the stellar position.
Geocentric mid-time of the event is 06:14:51 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 51 km, so central chords are expected to last 4.5 seconds.