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Occultations of stars by asteroids have been observed since 1961, increasingfrom a very small number to now over 500 annually. We have created andregularly maintain a growing data-set of more than 5,000 observed asteroidaloccultations. The data-set includes: the raw observations; astrometry at the 1mas level based on centre of mass or figure (not illumination); where possiblethe asteroid's diameter to 5 km or better, and fits to shape models; theseparation and diameters of asteroidal satellites; and double star discoverieswith typical separations being in the tens of mas or less. The data-set ispublished at NASA's Planetary Data System and is regularly updated. We providehere an overview of the data-set, discuss the issues associated withdetermining the astrometry and diameters, and give examples of what can bederived from the data-set. We also compare the occultation diameters ofasteroids with the diameters measured by the satellites NEOWISE, AKARI AcuA,and IRAS, and show that the best satellite-determined diameter is a combinationof the diameters from all three satellites.

Precise astrometry and diameters of asteroids from occultations -- a data-set of observations and their interpretation