2020 Predictions with Occult v 22.214.171.124 + Astorb data 2019 Dec 10
For stars visual magnitude 13.0 and brighter, maximum duration >1 sec and magnitude drop >0.7 during occultation. Asteroid diameters >25 km.
These predicted paths are subject to orbital uncertainty. Please search for updates nearer the time e.g. from Steve Preston's web pages at http://www.asteroidoccultation.com/IndexAll.htm
about the prediction headers using asteroid 131 Vala as example.
Remember that prior to occultation (UT +/- 10min) the object brightness is the star+asteroid whichever is the brighter + a bit.