The interactive map below shows our current prediction for the stellar occultations by (617) Patroclus/Menoetius on 2021 May 9 UT. The prediction is based on a Gaia DR2 position for the star, corrected for parallax and proper motion, and the v20210304191151 orbit estimate for Patroclus/Menoetius, which has a 1-sigma cross-track uncertainty of 18 km.
Geocentric mid-time of the event is 08:38:02 UT. Star position is RA 16:00:08.3, Dec -28:49:20 (J2000), and its magnitude is 11.49. Patroclus and Menoetius are moving at 17.5 km/s with respect to the star and their diameters are estimated to be 127 km and 117 km, respectively, so central chords are expected to last 7.3 seconds for Patroclus and 6.7 seconds for Menoetius. The system magnitude (Patroclus+Menoetius) is predicted to be 15.1 at event time, so it will be 28 times fainter than the star.