The interactive map below shows our current prediction for the occultation by (21900) Orus on 2024 January 9 UT. The prediction is based on a Gaia eDR3 position for the star, corrected for parallax and proper motion, and the v20230506024047 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 02:11:45.5 UT. The J2000 star position is RA 06:58:06.6 (6.9684881), Dec +18:04:08 (18.068899), and its magnitude is 13.62. Orus is moving at 16.8 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 06:59:30.5 (6.9918056), Dec +18:02:06 (18.035000).