PDS_VERSION_ID = PDS3 RECORD_TYPE = "STREAM" OBJECT = TEXT PUBLICATION_DATE = 2011-05-16 NOTE = "AAREADME File for re-organized IHW data set" END_OBJECT = TEXT END Re-organized International Halley Watch (IHW) Data Sets ======================================================= The original IHW "mixed disks" contained ground-based observations from various networks ("nets" in IHW parlance). These data, belonging to over two dozen individual data sets, were intermixed on the orignal set of volumes called HAL_0019 to HAL_0023. The data were sorted choronologically by date of observation only, and were otherwise not separated by data set ID or type of observation. The data were also archived under a fairly early form of the PDS Standards, 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. - A.C.Raugh, 2011-05-11