The interactive map below shows our current prediction for the stellar occultation by (52246) Donaldjohanson on 2020 December 29 UT. The prediction is based on a Gaia DR2 position for the star and the v20181130000225 orbit estimate for Donaldjohanson.
Geocentric mid-time of the event is 03:17:26 UT. Star position is RA 04:06:32.2, Dec +21:20:14 (J2000), and its magnitude is 13.34. Donaldjohanson is moving at 4 km/s with respect to the star and its diameter is estimated to be 5 km, so central chords are expected to last 1.2 seconds.