PDS_VERSION_ID = PDS3                                                         
                                                                              
RECORD_TYPE    = "STREAM"                                                     
                                                                              
OBJECT     = TEXT                                                             
  PUBLICATION_DATE = 2011-05-17                                               
  NOTE             = "AAREADME File for re-organized IHW data set"            
END_OBJECT = TEXT                                                             
                                                                              
END                                                                           
                                                                              
Re-organized International Halley Watch (IHW) Data Sets                       
=======================================================                       
This data set was included as part of the "mixed disks", HAL_0019 to          
HAL_0023.  There are no actual data in this data set - it exists to           
document data submitted to the Large-Scale Phenomena Network that             
for reasons of quality or time could not be digitized for archiving.          
See the IHW-C-LSPN-2-DIDR-HALLEY-V1.0 data set and any later versions         
for the digitized data.                                                       
                                                                              
The data were archived under a fairly early form of the PDS                   
Standards, and formatted to an equally early form of the FITS                 
standard, where appropriate, resulting in some particularly arcane            
formats for the modern user - including PDS labels with deprecated            
terminology and almost no metadata, a FITS headers which refer to an          
extension type of 'COMPRESS' that was never formally adopted into the         
standard and no longer exists even as a conforming extension.                 
                                                                              
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 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, 2011-05-17