Data Set Overview :  This data set is intended to include all reported timings of observed asteroid occultation events, as well as asteroid axes derived from those timings by David W. Dunham and David Herald. Most of these timings are unpublished and have been collected by Dunham and Herald. This version is complete through the end of 2006 and contains additional events from 2007.  The asteroid sizes (major and minor axes) derived from the occultation timing data are the result of an analysis program by Dunham and Herald, applied consistently to all the occultation events.  Data :  The asteroid occultation timing data are collected into two files. The occlist file lists a total of 1055 occultations, one occultation per line, along with the identification of the asteroid and star, and additional information about the star including RA and dec. These lines also include the major and minor axes derived from the timings for that occultation, if any, along with information about the analysis. The list is chronological, with an occultation ID assigned to each one. The occtimings file lists the individual timings measured for each occultation, with one disappearance and reappearance per line, as well as information about the observing site and the observational circumstances. The latitude, longitude, and elevation of each site are included.  Two analogous files, occsatlist and occsattime, with occultation data on planetary satellites, are also included.  Ancillary Data :  Summary files, occsummary.tab and occsatsummary.tab, contain the major and minor axes and position angles from the elliptical or circular fits, extracted from occlist and occsatlist respectively.  Modification History :  The first version of this data set, introduced in 2003, included occultations only through 1998. The update of 2004 not only adds occultations through March 1, 2004, but also provides a more systematic arrangement of the data. The data set was again updated in 2005 and 2006 with the addition of more occultation events through Apr. 11, 2006. The 2007 version is complete through 2006 with additional events from 2007.

Confidence Level Overview : This data set is compiled from the observations made by a large number of observers. Indications to the confidence level of each observation are included in the data files.