Data Set Overview
  =================
 
  This data set is intended to include all reported timings of observed
  asteroid, planet, and planetary satellite occultation events, as well as
  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  of these timings are unpublished and have been collected by Dunham and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 2008.
 
  The 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 1417 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
  planets and 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, 2006,
  2007, 2008, and 2009.

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.