PDS_VERSION_ID        = PDS3                                                  
RECORD_TYPE           = STREAM                                                
OBJECT                = TEXT                                                  
  PUBLICATION_DATE    = 2016-09-01                                            
  NOTE                = "GEOMINFO.TXT describes the files which reside in     
                         the GEOMETRY directory on this volume."              
END_OBJECT            = TEXT                                                  
END                                                                           
                                                                              
                                                                              
The GEOMETRY directory contains the Ceres planetary constants (pole           
orientation, spin rate, and prime meridian) in SPICE PCK format.  The         
IAU (2015) approved planetary constants for Ceres are based on Dawn Ceres     
Approach, RC3, and Survey images. This file contains values that              
were determined during the stereo photogrammetric analysis of Dawn images     
during the creation of the HAMO DTM. The constants provided here are          
described by [PREUSKERETAL_2016] and are discussed in the data set catalog     
contained on this volume. The differences between the new HAMO values and     
the older IAU values are all within the stated error bars of the older        
values. Table 2 in the data set catalog file (FC2_CERES_HAMO_DTM_SPG_DS.CAT)  
on this volume compares the two sets of values and lists the errors estimates 
for each of the values, old and new.                                          
                                                                              
The GEOMETRY directory contains the following file:                           
                                                                              
     dawn_ceres_SPG20160107.tpc                                               
                                                                              
Users of the DTM should also use this planetary constants kernel for SPICE    
based image processing.