Data Set Overview : This data set is intended to include all reported timings of observed asteroid occultation events through Mar. 1, 2004, as well as asteroid occultation 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 Most of these timings are unpublished and have been collected by Dunham and Herald.  Data : The asteroid occultation timing data are collected into two files. The occlist file lists a total of 524 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 : Because of its convenience, a file containing derived occultation diameters collected by David Dunham and published in Asteroids II pp. 148-170 [MILLIS&DUNHAM1989] and in Dunham et al. 2002 (Memorie della Societa Astronomica Italiana, 73, 662-665) [DUNHAMETAL2002] is also included. These diameters are superseded by the derived major and minor axes listed in the full occultations list, occlist.tab.  Modification History : The first version of this data set, introduced in 2003, included occultations only through 1998. This update, in 2004, not only adds occultations through March 1, 2004, but also provides a more systematic arrangement of the data. 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.

Review: This data set underwent external peer review on May 20, 2004.