PDS_VERSION_ID                     = PDS3                                     
LABEL_REVISION_NOTE                = "2005-08-10:  Auto-generated by OLAF;"   
                                                                              
OBJECT                             = DATA_SET                                 
 DATA_SET_ID                       = "EAR-C-I0039-2-SBN0007/KECKIIESI-V1.0"   
                                                                              
 OBJECT                            = DATA_SET_INFORMATION                     
  DATA_SET_NAME                    = "KECK II ESI IMAGES OF 81P/WILD 2"       
  DATA_SET_COLLECTION_MEMBER_FLG   = "N"                                      
  DATA_OBJECT_TYPE                 = {"IMAGE", "TABLE"}                       
  START_TIME                       = 2003-12-19                               
  STOP_TIME                        = 2003-12-21T16:08:56.73                   
  DATA_SET_RELEASE_DATE            = 2004-10-18 /*Review Date*/               
  ARCHIVE_STATUS                   = "LOCALLY ARCHIVED"                       
  PRODUCER_FULL_NAME               = "DAVID THOLEN"                           
  DETAILED_CATALOG_FLAG            = "N"                                      
  DATA_SET_TERSE_DESC              = "CCD images of comet 81P/Wild 2 taken    
        2003 December 19-21 UT with the ESI instrument on Keck II in support  
        of the Stardust encounter."                                           
                                                                              
  CITATION_DESC                    = "Tholen, D.J., Keck II ESI images of     
        81P/Wild 2. EAR-C-I0039-2-SBN0007/KECKIIESI-V1.0. NASA Planetary Data 
        System, 2004."                                                        
                                                                              
  ABSTRACT_DESC                    = "CCD images of comet 81P/Wild 2 taken    
        2003 December 19-21 UT with the ESI instrument on Keck II in support  
        of the Stardust encounter."                                           
                                                                              
  DATA_SET_DESC                    = "                                        
                                                                              
                                                                              
  Data Set Overview                                                           
  =================                                                           
    The Stardust mission required both astrometric and photometric            
    observations from ground-based telescopes to fine-tune the circumstances  
    for the 2004 January 2 UT spacecraft encounter with comet 81P/Wild 2.  The
    astrometric data provided critical third-dimension information that       
    improved the encounter time, while the photometric data provided          
    information on the level of activity for the comet, which was used to     
    decide on a flyby distance.  The Stardust project arranged for some of    
    these observations to be made with the Keck II telescope on Mauna Kea     
    using the ESI instrument in imaging mode, which illuminates a subset of   
    the detector with a 2 by 8 arcmin field.  The R filter provided by Richard
    Ellis (the 'Ellis R filter') was used for all observations because it is  
    the only one in the ESI instrument that accommodates the full 2 by 8      
    arcmin field of view.  Altogether, 57 images of the comet were obtained on
    the nights of 2003 December 19-21 UT, as well as bias frames, flat field  
    frames, and images of Landolt standard stars.  The processed images in    
    this data set have had the average value of the overscan region           
    subtracted, a two-dimensional bias pattern subtracted based on an average 
    of several overscan-subtracted bias images, and were divided by a flat    
    field image based on the median of all the overscan-subtracted and bias   
    subtracted twilight sky flat field images.  All three nights were         
    photometric.  To compute the photometric zero point of the images, a      
    synthetic aperture of radius 40 pixels was utilized on all astrometric    
    reference stars.  The pixel size is 0.155 arcseconds."                    
                                                                              
  CONFIDENCE_LEVEL_NOTE            = "NONE PROVIDED"                          
                                                                              
  END_OBJECT                       = DATA_SET_INFORMATION                     
                                                                              
  OBJECT                           = DATA_SET_MISSION                         
   MISSION_NAME                    = "SUPPORT ARCHIVES"                       
  END_OBJECT                       = DATA_SET_MISSION                         
                                                                              
  OBJECT                           = DATA_SET_HOST                            
   INSTRUMENT_HOST_ID              = "OBS378T2"                               
   INSTRUMENT_ID                   = "I0039"                                  
  END_OBJECT                       = DATA_SET_HOST                            
                                                                              
  OBJECT                           = DATA_SET_REFERENCE_INFORMATION           
    REFERENCE_KEY_ID               = "N/A"                                    
  END_OBJECT                       = DATA_SET_REFERENCE_INFORMATION           
                                                                              
  OBJECT                           = DATA_SET_TARGET                          
   TARGET_NAME                     = "81P/WILD 2 (1978 A2)"                   
  END_OBJECT                       = DATA_SET_TARGET                          
                                                                              
  OBJECT                           = DATA_SET_TARGET                          
   TARGET_NAME                     = "CALIBRATION"                            
  END_OBJECT                       = DATA_SET_TARGET                          
                                                                              
  OBJECT                           = DATA_SET_TARGET                          
   TARGET_NAME                     = "SKY"                                    
  END_OBJECT                       = DATA_SET_TARGET                          
                                                                              
  OBJECT                           = DATA_SET_TARGET                          
   TARGET_NAME                     = "STAR"                                   
  END_OBJECT                       = DATA_SET_TARGET                          
                                                                              
END_OBJECT                         = DATA_SET                                 
                                                                              
END