PDS_VERSION_ID = PDS3 RECORD_TYPE = "STREAM" OBJECT = TEXT PUBLICATION_DATE = 2011-05-24 NOTE = "AAREADME File for re-organized IHW data set" END_OBJECT = TEXT END Re-organized International Halley Watch (IHW) Data Sets ======================================================= The original IHW HAL_0024 disk contained ground-based observations from various networks ("nets" in IHW parlance) of comets Giacobini-Zinner and Crommelin - both used as test targets by the IHW observers. These data on Comet 27P/Crommelin, belonging to 18 individual data sets, were in a separate subdirectory tree of the original volume. The data were sorted into additional subdirectories by discipline network, but were not otherwise separated by data set ID. The data were ostensibly archived under PDS1 standards, but no catalog files or labels were included on the disk. The information in the PDS catalog database is very generic and nearly identical for each data set in this collection. Users interested in the individual observations would likely get more useful information from the published IHW books and papers. The catalog files provided here were dumped from the PDS catalog database but not otherwise altered except to correct the target, which was incorrectly listed as Comet 1P/Halley prior to this reorganization effort. The reorganization effort sought to separate the data files constituting the unique data sets into a more contemporary, single-data-set-per-volume format for ease of access and distribution. The data are subdivided into directories by date, unless the number of observations is small enough that such a division did not seem useful. The data files and most supporting files are presented here in their original format, problematic though that might be. The additional ancillary directories, including documentation, ephemerides and such, are duplicated in their entirety in all the related separate data sets. - A.C.Raugh, 2011-05-24