The interactive map below shows our current prediction for the stellar occulation by (52246) Donaldjohanson on 2019 April 13 UT. The prediction is based on a Gaia DR2 position for the star and the v20181128185850 orbit estimate for Donaldjohanson.
Geocentric mid-time of the event is 02:11:28 UT. Star position is RA 20:36:27.2, Dec -16:45:58 (J2000), and its magnitude is 12.44. Donaldjohanson is moving at 23 km/s with respect to the star and its diameter is estimated to be 5 km, so central chords are expected to last 0.22 seconds.