Patroclus Occultation 2022-06-04 (G* = 8.4)

The interactive map below shows our current prediction for the stellar occultations by (617) Patroclus/Menoetius on 2022 June 4 UT. The prediction is based on a Gaia eDR3 position for the star, corrected for parallax and proper motion, and the v20220419170402 orbit estimate for Patroclus/Menoetius, which has a 1-sigma cross-track uncertainty of 5 km and a 1-sigma downtrack uncertainty of 1 sec for this event (these are placeholder values).

Geocentric mid-time of the event is 09:27:14 UT. The J2000 star position is RA 18:40:22.5 (18.672909), Dec -43:52:22 (-43.872909), and its magnitude is 9.82. Patroclus and Menoetius are moving at 15.3 km/s with respect to the star and their diameters are estimated to be 113 km and 108 km, respectively, for this occultation so central chords are expected to last 7.4 seconds for Patroclus and 7.1 seconds for Menoetius. The system magnitude (Patroclus+Menoetius) is predicted to be 15.2 at event time, so it will be 140 times fainter than the star.

Of-date coordinates for the target star on event night are RA 18:41:59.8 (18.699944), Dec -43:51:02 (-43.850556).

Updated: Apr 19, 2022