PDS_VERSION_ID = PDS3 RECORD_TYPE = "STREAM" OBJECT = TEXT PUBLICATION_DATE = 2011-05-18 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 Giacobini-Zinner, belonging to two dozen individual data sets, were intermixed on the original volume. The data were sorted chronologically by date of observation only, and were otherwise not separated by data set ID or type of observation. The data were also archived under the PDS1 standards, which bear little resemblence to the PDS standards of today (currently PDS3, with PDS4 in development), and formatted to an equally early form of the FITS table standard, where appropriate, resulting in some particularly arcane formats for the modern user - including PDS labels with deprecated terminology and a preponderance of single-record FITS ASCII table files with header segments separated from data segments. 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 have been sorted into a subdirectory hierarchy based on observation date, unless the number of data files was small enough that this seemed more disruptive than helpful, in which case all the observations are located directly in the DATA/ subdirectory. The data files and most supporting files are presented here in their original format, problematic though that might be. Users interested in analyzing the data would probably do well to inquire of the PDS or the Small Bodies Node for version 2.0 of the observational data set. The additional ancillary directories, including documentation, ephemerides, software and such, are duplicated in their entirety in all the related separate data sets - A.C.Raugh, 2011-05-18