PDS_VERSION_ID               = PDS3                                           
                                                                              
RECORD_TYPE                  = "FIXED_LENGTH"                                 
RECORD_BYTES                 = 272                                            
FILE_RECORDS                 = 1500                                           
                                                                              
^TABLE                       = "HISANG.TAB"                                   
                                                                              
DATA_SET_ID                  = "GIO-C-IMS-3-RDR-HIS-GRIGG-SKJELL-V1.0"        
PRODUCT_ID                   = "IMS-HISANG-199512"                            
PRODUCT_NAME                 = "GIOTTO EXTENDED MISSION IMS ANGULAR RESULTS"  
PRODUCT_CREATION_TIME        = 1995-12-31                                     
                                                                              
TARGET_NAME                  = "26P/GRIGG-SKJELLERUP 1 (1922 K1)"             
INSTRUMENT_HOST_NAME         = "GIOTTO"                                       
INSTRUMENT_NAME              = "ION MASS SPECTROMETER"                        
START_TIME                   = 1992-07-10T14:44:36.2                          
STOP_TIME                    = 1992-07-10T16:13:24.5                          
                                                                              
SPACECRAFT_CLOCK_START_COUNT = "UNK"                                          
SPACECRAFT_CLOCK_STOP_COUNT  = "UNK"                                          
                                                                              
DESCRIPTION              = "This file contains results from the High Intensity
  Spectrometer (HIS) instrument flown aboard the Giotto                       
  spacecraft during its extended mission to comet                             
  P/Grigg-Skjellerup.  The results are binned according                       
  to angle of reception."                                                     
                                                                              
RECORD_FORMAT                = "I3,2(1X,F7.1),1X,E9.3,80(I3)"                 
                                                                              
NOTE     = "This file was received as a FITS file containing an ASCII table in
  slightly non-standard format.  The format was adjusted, preserving          
  the original bytes, to conform to the full FITS ASCII table standard        
  in order to produce the accompanying FITS file.                             
                                                                              
  During final reformatting to produce the PDS file described by this         
  label, it was noted that the last byte of each record appeared to           
  have been truncated at some point during processing.  It was                
  determined that the FITS file received by the Small Bodies Node had         
  also had this byte missing.  Communication with Dr. Altwegg                 
  indicated that it was not possible to restore this information by           
  the time of completion of the GEM archive disk, so it was decided to        
  include the file with the remnants of the truncated field and this          
  notation."                                                                  
                                                                              
OBJECT     = TABLE                                                            
  NAME               = "ANGULAR_BINS"                                         
                                                                              
  NOTE               = "The timing data for record 1363 was corrupted at some 
    during production.  The record has been left in the same                  
    state in which it was received."                                          
                                                                              
  INTERCHANGE_FORMAT = "ASCII"                                                
  COLUMNS            = 5                                                      
  ROW_BYTES          = 272                                                    
  ROWS               = 1500                                                   
  DESCRIPTION     = "This table lists counts recorded during the time interval
    in each of 80 azimuth-elevation bins.  There are 16 azimuth               
    ranges, each of which has data recorded at 5 elevations.                  
    For the correspondence between bin number and azimuth-                    
    elevation, see the accompanying file HISANGBN.TAB."                       
                                                                              
  OBJECT     = COLUMN                                                         
    NAME             = "DAY"                                                  
    BYTES            = 3                                                      
    DATA_TYPE        = "ASCII_INTEGER"                                        
    START_BYTE       = 1                                                      
    FORMAT           = "I3"                                                   
    UNIT             = "DAYS"                                                 
    INVALID_CONSTANT = -99                                                    
    DESCRIPTION      = "Day number.  This is always equal to 192 (10 July) in 
      this file."                                                             
    NOTE     = "The only INVALID_CONSTANT value in this field occurs in record
      1363."                                                                  
  END_OBJECT = COLUMN                                                         
                                                                              
  OBJECT     = COLUMN                                                         
    NAME             = "START_TIME"                                           
    BYTES            = 7                                                      
    DATA_TYPE        = "ASCII_REAL"                                           
    START_BYTE       = 5                                                      
    FORMAT           = "F7.1"                                                 
    UNIT             = "SECONDS"                                              
    INVALID_CONSTANT = -5.3                                                   
    DESCRIPTION  = "The number of UT seconds from midnight to the start of the
      observation.  This refers to spacecraft event time (SCET)."             
    NOTE     = "The only INVALID_CONSTANT value in this field occurs in record
      1363."                                                                  
  END_OBJECT = COLUMN                                                         
                                                                              
  OBJECT     = COLUMN                                                         
    NAME             = "STOP_TIME"                                            
    BYTES            = 7                                                      
    DATA_TYPE        = "ASCII_REAL"                                           
    START_BYTE       = 13                                                     
    FORMAT           = "F7.1"                                                 
    UNIT             = "SECONDS"                                              
    INVALID_CONSTANT = -1.3                                                   
    DESCRIPTION      = "The number of seconds from midnight to the end of the 
      observation.  This refers to spacecraft event time (SCET)."             
    NOTE     = "The only INVALID_CONSTANT value in this field occurs in record
      1363."                                                                  
  END_OBJECT = COLUMN                                                         
                                                                              
  OBJECT     = COLUMN                                                         
    NAME        = "DISTANCE"                                                  
    BYTES       = 9                                                           
    DATA_TYPE   = "ASCII_REAL"                                                
    START_BYTE  = 21                                                          
    FORMAT      = "E9.3"                                                      
    UNIT        = "KILOMETERS"                                                
    DESCRIPTION = "Distance to the comet nucleus.  This is expressed as a     
      negative number for observations in which the spacecraft                
      was still approaching the comet."                                       
    NOTE        = "The value in record 1363 is likely invalid."               
  END_OBJECT = COLUMN                                                         
                                                                              
  OBJECT     = COLUMN                                                         
    NAME             = "COUNTS"                                               
    BYTES            = 240                                                    
    DATA_TYPE        = "ASCII_INTEGER"                                        
    START_BYTE       = 30                                                     
    ITEMS            = 80                                                     
    ITEM_BYTES       = 3                                                      
    FORMAT           = "I3"                                                   
    UNIT             = "COUNTS/SPIN"                                          
    INVALID_CONSTANT = -99                                                    
    DESCRIPTION     = "This array can be interpreted as a 2-dimensional matrix
                     of counts/spin, with row number corresponding to azimuth 
                     and column to elevation.  The table is arranged so that  
                     the Y axis varied most quickly.                          
                                                                              
      Each azimuth bin is 22.5 degrees wide, the first starts at 0 degrees.   
      For each azimuth value, there are 5 elevation ranges.  These are:       
      0-5, 5-10, 10-13.5, 13.5-18, and 18-22.5 degrees.  The bin ranges       
      are also listed in the accompanying 'HISANGBN.TAB' file."               
                                                                              
    NOTE             = "As indicated in the NOTE above, the final byte in the 
                     last (80th) item was lost somewhere during processing,   
                     and has been replaced by a blank character.              
                                                                              
      Only two records have non-blank bytes in the last ITEM (indicating      
      original counts greater than 9): records 630 and 813."                  
                                                                              
  END_OBJECT = COLUMN                                                         
                                                                              
END_OBJECT = TABLE                                                            
                                                                              
END