PVO Spacecraft VSO Ephemeris and Spacecraft Orientation Data Bundle Readme                     
                                                                                               
Introduction                                                                                   
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This document contains information pertaining to the PVO Spacecraft VSO Ephemeris and          
Spacecraft Orientation Data Bundle. This bundle includes Pioneer Venus Orbiter (PVO) spacecraft
position and orientation data in Venus Solar Orbital (VSO) coordinates, in ASCII and Original  
Binary forms.                                                                                  
                                                                                               
This bundle is organized into 3 collections, including:PVO Spacecraft VSO Ephemeris and        
Spacecraft Orientation Original Binary Data Collection                                         
(urn:nasa:pds:pvo-ephem:data-vso-bin), PVO Spacecraft VSO Ephemeris and Spacecraft             
Orientation ASCII Data Collection (urn:nasa:pds:pvo-ephem:data-vso-asc), and PVO Spacecraft VSO
Ephemeris and  Spacecraft Orientation Document Collection (urn:nasa:pds:pvo-ephem:document).   
PDS4 documentation is all XML. There is an XML label for every product in the archive.         
                                                                                               
PVO Spacecraft VSO Ephemeris and Spacecraft Orientation Original Binary Data Collections       
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These collections are sampled every 12 seconds near periapsis, and at 1 minute or 10 minute    
rates in the solar wind, the lowest rates near apoapsis.  Planetocentric and heliocentric      
position vectors and solar zenith angle (Sun-Venus-PVO) are also provided. The VSO parameters  
are derived from the PVO Supplemental Experimenter Data Records (SEDR), other parameters are   
taken directly from the SEDR bundle.                                                           
                                                                                               
Every effort has been made to insure that the data are of the best quality available. However, 
users are encouraged to verify the correctness of the data prior to submitting any publications
or other work based on these data and report any issues to PDS/PPI.                            
                                                                                               
This is a PDS4 archive of the following PDS3 data set:                                         
PVO-V-POS-5--VSOCOORDS-12SEC-V1.0 (https://doi.org/10.17189/1519830)                           
                                                                                               
These data collections were originally archived under PDS3 in the following volumes:           
PVO-V-POS-5--VSOCOORDS-12SEC-V1.0 in PV01_0001 to PV01_0068                                    
                                                                                               
Under the PDS3 standard all archives were self contained and could in principle be stored in a 
single file system (disk, CD-ROM, etc.).  PDS4 takes advantage of the network capabilities that
allow archives to be distributed.  As a result, some of the documents and metadata previously  
stored in the PDS3 catalog files are no longer maintained locally, but are  maintained in a    
central repository.  Those files are referenced by unique PDS logical identifiers that are     
included in the document collection inventory.                                                 
                                                                                               
Errata                                                                                         
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There is no known errata. An errata file was included if more issues are discovered.           
                                                                                               
Contacts                                                                                       
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For questions or problems regarding this bundle, please contact the PDS                        
Planetary Plasma Interactions Node:                                                            
                                                                                               
  Email             pds_operator@igpp.ucla.edu