PDS_VERSION_ID                = PDS3                                          
                                                                              
/* File Characteristics */                                                    
                                                                              
RECORD_TYPE                   = FIXED_LENGTH                                  
RECORD_BYTES                  = 34                                            
FILE_RECORDS                  = 9999                                          
                                                                              
/* Data Object Pointers */                                                    
                                                                              
^TABLE                        = "ASTERMAG.TAB"                                
                                                                              
/* Identification Keywords */                                                 
                                                                              
DATA_SET_ID                   = "EAR-A-5-DDR-ASTERMAG-V4.0"                   
PRODUCT_NAME                  = "Asteroid Magnitudes and Slopes V4.0"         
PRODUCT_ID                    = "ASTERMAG-ASTERMAG-199904"                    
INSTRUMENT_HOST_NAME          = "N/A"                                         
INSTRUMENT_NAME               = "N/A"                                         
TARGET_NAME                   = ASTEROID                                      
PRODUCT_CREATION_TIME         = 1999-04-09  /* Peer Review Date */            
START_TIME                    = "N/A"                                         
STOP_TIME                     = "N/A"                                         
                                                                              
/* Data Object Descriptions */                                                
                                                                              
OBJECT                        = TABLE                                         
 ROWS                         = 9999                                          
 ROW_BYTES                    = 34                                            
 INTERCHANGE_FORMAT           = ASCII                                         
 COLUMNS                      = 5                                             
 DESCRIPTION                  = "                                             
                                                                              
IAU-adopted magnitude parameters (absolute V magnitude and slope parameter)   
for all numbered asteroids.                                                   
                                                                              
This version of the dataset contains magnitude parameters for all asteroids   
numbered as of the 1999 February 2 batch of Minor Planet Circulars and        
includes 9999 entries.  The absolute magnitude database underwent a major     
revision during the past year, with updated values being published on Minor   
Planet Circulars 28104 through 28116.  Known errors were corrected at that    
time, and magnitude parameters that had been taken from the literature for    
previous versions of the PDS database became formally adopted.  Nevertheless, 
a pointer to the original reference for those magnitude parameters has been   
retained in the note field.  Although the updated list as published in the    
Minor Planet Circulars includes values for all asteroids numbered as of that  
time, many were not changed from the previously published list.  For purposes 
of this database, unchanged magnitude parameters retain their original        
reference, which should make it easier for the user to determine which have   
been updated.                                                                 
                                                                              
References:  Bowell, E., B. Hapke, D. Domingue, K. Lumme, J. Peltoniemi, and  
             A. W. Harris 1989.  Application of photometric models to         
             asteroids.  In Asteroids II (R. P. Binzel, T. Gehrels, and M. S. 
             Matthews, Eds.), pp. 524-556.  Univ. of Arizona Press, Tucson.   
                                                                              
             Spencer, J. R., L. A. Akimov, C. Angeli, P. Angelini, M. A.      
             Barucci, P. Birch, C. Blanco, M. Buie, A. Caruso, V. G. Chiornij,
             F. Colas, P. Dentchev, M. C. De Sanctis, E. Dotto, M.            
             Fulchignoni, S. Green, A. Harris, T. Hudecek, A. V. Kalashnikov, 
             V. V. Kobelev, V. P. Kozhevnikov, Y. Krugly, D. Lazzaro, J.      
             Lecacheux, J. MacConnell, T. Michalowski, R. A. Mohamed, B.      
             Mueller, T. Nakamura, C. Neese, W. Osborn, P. Pravec, D.         
             Riccioli, V.  Shevchenko, D. Tholen, F. Velichko, C. Venditti,   
             R. Venditti, W.  Wisniewski, J. Young, and B. Zellner 1995.  The 
             lightcurve of 4179 Toutatis: Evidence for complex rotation.      
             Icarus 117, 71-89.                                               
                                                                              
"                                                                             
 OBJECT                       = COLUMN                                        
  COLUMN_NUMBER               = 1                                             
  NAME                        = "ASTEROID ID"                                 
  DESCRIPTION                 = "Asteroid catalog number."                    
  DATA_TYPE                   = ASCII_INTEGER                                 
  START_BYTE                  = 1                                             
  BYTES                       = 5                                             
  FORMAT                      = I5                                            
 END_OBJECT                   = COLUMN                                        
                                                                              
 OBJECT                       = COLUMN                                        
  COLUMN_NUMBER               = 2                                             
  NAME                        = "ABSOLUTE V MAGNITUDE"                        
  UNIT                        = "MAGNITUDE"                                   
  DESCRIPTION                 = "                                             
The absolute magnitude is variously given to 0.01, 0.1, or 1.0 mag            
precision, depending on the accuracy and consistency of the data used to      
arrive at the value.                                                          
"                                                                             
  DATA_TYPE                   = ASCII_REAL                                    
  START_BYTE                  = 7                                             
  BYTES                       = 5                                             
  FORMAT                      = "F5.2"                                        
 END_OBJECT                   = COLUMN                                        
                                                                              
 OBJECT                       = COLUMN                                        
  COLUMN_NUMBER               = 3                                             
  NAME                        = "SLOPE PARAMETER"                             
  DESCRIPTION                 = "                                             
Those slope parameters that were determined by fitting the IAU-adopted        
phase function to data are given an origin code letter of 'f' (for            
'fitted'); all others are given a code letter of 'a' (for 'assumed').         
The default value is 0.15 in all cases.  Note that because most absolute      
magnitudes are based on apparent magnitudes measured at non-zero phase        
angles, the value of the absolute magnitude does depend on the assumed        
value for the slope parameter.  A change in the assumed value of the          
slope parameter (based on a taxonomic classification, for example) should     
not be made independently of the absolute magnitude.                          
"                                                                             
  DATA_TYPE                   = ASCII_REAL                                    
  START_BYTE                  = 13                                            
  BYTES                       = 5                                             
  FORMAT                      = "F5.2"                                        
 END_OBJECT                   = COLUMN                                        
                                                                              
 OBJECT                       = COLUMN                                        
  COLUMN_NUMBER               = 4                                             
  NAME                        = "SLOPE PARAMETER ORIGIN FLAG"                 
  DESCRIPTION                 = "                                             
Those slope parameters that were determined by fitting the IAU-adopted        
phase function to data are given an origin code letter of 'f' (for            
'fitted'); all others are given a code letter of 'a' (for 'assumed').         
"                                                                             
  DATA_TYPE                   = CHARACTER                                     
  START_BYTE                  = 19                                            
  BYTES                       = 1                                             
  FORMAT                      = A1                                            
 END_OBJECT                   = COLUMN                                        
                                                                              
 OBJECT                       = COLUMN                                        
  COLUMN_NUMBER               = 5                                             
  NAME                        = "REFERENCE"                                   
  DESCRIPTION                 = "                                             
'MPC' in the reference field stands for 'Minor Planet Circular', published on 
behalf of Commission 20 of the International Astronomical Union by the Minor  
Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138.    
"                                                                             
  DATA_TYPE                   = CHARACTER                                     
  START_BYTE                  = 21                                            
  BYTES                       = 9                                             
  FORMAT                      = A9                                            
 END_OBJECT                   = COLUMN                                        
                                                                              
END_OBJECT                    = TABLE                                         
END