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  Most of these timings are unpublished and have been collected by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 2007
  and contains additional events from 2008.
 
  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 1203 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.
 
  Graphics image files show plots of the occultation fits for many of
  the occultations.  These image files are located in the document
  directory, and are accompanied by a descriptive text file
  0Graphics.asc explaining how the plots are to be read.  The
  filenames of the image files concatenate the asteroid number,
  asteroid name or provisional designation, and occultation date.
 
  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 and 2007.  The 2008 version is complete through
  2007 with additional events from 2008.

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.