The interactive map below shows our current prediction for the occultation by (21900) Orus on 2024 January 5 UT. The prediction is based on a Gaia eDR3 position for the star, corrected for parallax and proper motion, and the v20230506022620 orbit estimate for Orus, which is derived from orus_20221130a.bsp. This ephemeris has a 1-sigma crosstrack uncertainty of 10.0 km and a 1-sigma downtrack uncertainty of 0.1 sec for this event (these are placeholder values).
The geocentric mid-time of the event is 11:15:01.3 UT. The J2000 star position is RA 07:00:15.2 (7.0042166), Dec +18:04:09 (18.069128), and its magnitude is 14.17. Orus is moving at 16.9 km/s with respect to the star and its diameter is estimated to be 60.5 km, so central chords are expected to last 3.6 seconds.
Of-date coordinates for the target star on event night are RA 07:01:39.1 (7.0275278), Dec +18:02:02 (18.033889).