PDS_VERSION_ID = PDS3                                                         
RECORD_TYPE    = STREAM                                                       
OBJECT         = TEXT                                                         
  PUBLICATION_DATE = 1999-10-19                                               
  NOTE             = "INFO.TXT describes the ephemeris data files             
                      available on this volume."                              
END_OBJECT     = TEXT                                                         
END                                                                           
                                                                              
The files in the directory EME50 contain spacecraft ephemeris data for        
the Lunar Prospector mission. Filenames in this directory follow the          
pattern Eyyddd.DAT, where yy is the year and ddd is the day of year for       
the start of the file. Thus, for example, E98032.DAT contains ephemeris       
data starting on day 32 of 1998 (that is, February 1, 1998). Files named      
Eyyddd.LBL are detached PDS labels for the corresponding files                
Eyyddd.DAT.                                                                   
                                                                              
The files are in ASCII format. Each file consists of an ASCII header,         
which contains a variety of information, followed by an ASCII table. The      
table has seven columns. The first column represents time; the next           
three columns give the space coordinates (x, y, and z) in Selenocentric       
Earth Mean Equatorial (1950) coordinates; and the last three columns          
contain the velocity components expressed in the same coordinates.            
                                                                              
Further information on these ephemeris files may be found in the Level 0      
Science Interface Specification document, LVL0SIS.PDF, which is located       
in the DOCUMENT/PROJECT directory. (See the root-level file AAREADME.TXT      
for further information on the DOCUMENT directory.)