The interactive map below shows our current prediction for the stellar occulation by (21900) Orus on 2021 August 13 UT. The prediction is based on a Gaia DR2 position for the star and the v20190110192156 orbit estimate for Orus.
Geocentric mid-time of the event is 02:57:19 UT. Star position is RA 02:07:01.5, Dec +20:36:56 (J2000), and its magnitude is 16.88. Orus is moving at 6 km/s with respect to the star and its diameter is estimated to be 62 km, so central chords are expected to last 10 seconds.