Data Set Overview : This data set is intended to include all groundbased asteroid radar detections. These entries were collected by Steven J. Ostro, and selected data have been provided as collected from the published literature. Scientific questions about this data set should be directed to Steven J. Ostro, JPL, at the email address ostro@echo.jpl.nasa.gov. (Effective date for this address: March 23, 1999.)  Modification History : The radar data set was first introduced into PDS at the April 1994 asteroid data sets review, and has been updated yearly since that time. Updates consist in adding entries for asteroid radar detections made since the previous update and adding full data for detections which have been published since the last update. The 1997 update added radar albedos, and these have continued to be added in subsequent updates.  Parameters : An entry for each detection reports radar cross-section, circular polarization and radar albedo, if known, error values for these parameters, year of observation, and the reference in which the observations were reported.  Data : This data set comprises a single data table, 'radar.tab', tabulating the parameters listed above.  Ancillary Data : The references of the papers in which the asteroid radar detections were reported are compiled in the file 'radarref.tab'.

Confidence Level Overview : The confidence level of each data value reported is reflected in the uncertainty value in the same entry. Further information about the observations can be obtained by consulting the original reference for each entry.  Review : This data set underwent external peer review on June 1, 2000.  Data Coverage and Quality : This data set is intended to include all groundbased radar detections of asteroids. It is complete through January 2000. If an item of data is missing from the table (appearing as a null value such as 9.99), this indicates that the data item is not available from the published paper. For example, for monostatic radar observations, circular polarization ratio cannot be derived, so it is left blank. In some cases, the data provided in the paper are too complex to be presented in the table, as in the case of a time-series of values. In case of questions, the original papers should be consulted.  Limitations : This data set is intended to collect the data reported in the published literature, as well as to record the existence of unpublished asteroid radar detections.