The interactive map below shows our current prediction for the stellar occultations by (617) Patroclus/Menoetius on 2021 June 4 UT. The prediction is based on a Gaia EDR3 position for the star, corrected for parallax and proper motion, and the v20210425213230 orbit estimate for Patroclus/Menoetius, which has a 1-sigma cross-track uncertainty of 14.6 km.
Geocentric mid-time of the event is 00:27:21 UT. Star position is RA 15:44:09.6, Dec -28:59:14 (J2000), and its magnitude is 14.67. Patroclus and Menoetius are moving at 17.4 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 1.5 times fainter than the star.