The Venus Climate Orbiter SPICE Data Archive


   This document provides an overview of the Venus Climate Orbiter
   (VCO, also known as PLANET-C and AKATSUKI) SPICE data set, including
   a description of the directory structure. Additional documents
   included in this data set provide more details, especially
   the ``'' dataset description and the various
   kernel-specific ``/data/*/*info.txt'' files.

   This data set contains navigation and related observation geometry
   and other ancillary data in the form of SPICE System kernel files
   for the Venus Climate Orbiter spacecraft. See the file ``''
   in the ``/catalog'' directory for a description of the Venus Climate
   Orbiter mission and the file ``'' in the same directory
   for a description of the Venus Climate Orbiter spacecraft.

   The SPICE kernel files contain geometric and other ancillary
   information needed to recover the full value of science instrument
   data. Data in the SPICE kernel files must be accessed using the NAIF
   (Navigation and Ancillary Information Facility) software called the
   SPICE Toolkit. See the file ``softinfo.txt'' in the ``/software''
   directory for instructions on how to obtain this software.

   This data set is contained on a single virtual volume, VCOSP_1000,
   including data from the cruising phase and the sun orbiting phase
   and the science phase(s) of the mission, covering from May 20, 2010
   through the end time of the latest spececraft trajectory file supplied
   in the data set. Until the end of the spacecraft lifespan this data
   set will be accumulating with new data added on a regular basis.

File Formats

   All text documents and other meta information files such as
   descriptions, PDS object definitions and detached PDS labels are
   stream format files, with a carriage return (ASCII 13) and a line
   feed character (ASCII 10) at the end of the record.  This allows the
   files to be read by MS-DOS/Windows, Unix and macOS operating systems.

   The data files in this data set were prepared to be used under a
   UNIX environment. Therefore all SPICE text kernel files are UNIX
   text files, with a line feed character (ASCII 10) at the end of the
   line, and all SPICE binary kernels files are UNIX binary files in
   which bit pattern structures for double precision and integer numbers
   follow the IEEE little endian standard. While some of the data files
   on this volume can be used 'as is', converting the files to binary or
   text format native to the user's computer may be required. Refer to
   the documentation provided with the SPICE Toolkit to find out whether
   conversion is needed in each specific case.

   NAIF provides a tool (BINGO) that can convert either binary or text
   kernels from one format to another. This means that text files can
   have their line terminator changed and binary files can be converted
   to the native format of the platform of interest. For access to this
   tool, see the reference to the NAIF utilities website in the file

Volume Contents

   Files on this volume are organized into a set of subdirectories
   below the top-level directory. The following table shows the
   structure and content of these directories. In this table, directory
   names are enclosed in square brackets ([]). See the ``*info.txt''
   files in each directory for specific information on the files in the
   directory, including naming schemes.

   |-- aareadme.txt        Text version of the aareadme file.
   |-- aareadme.htm        HTML version of the aareadme file.
   |-- aareadme.lbl        PDS label for both aareadme files.
   |-- errata.txt          Comments and errata on this volume.
   |--         Description of the contents of this volume.
   |--[catalog]            Directory containing PDS catalog objects.
   |  |
   |  |-- catinfo.txt      Description of files in the catalog directory.
   |  |--     Description of the spacecraft.
   |  |--      Description of the mission.
   |  |--       References for personnel who created this volume.
   |  |--          List of publications mentioned in *.cat files.
   |  |--      Description of the data set releases.
   |  |--      Description of the SPICE data set.
   |  |--    Description of housekeeping (browser) information.
   |  +--   Description of SPICE kernels.
   |--[data]               Directory containing SPICE data files (kernels.)
   |  |
   |  |--[ck]              Directory containing CK files.
   |  |  |
   |  |  |-- ckinfo.txt    Description of files in the data/ck directory.
   |  |  |-- *.bc          CK files.
   |  |  +-- *.lbl         PDS labels for CK files.
   |  |
   |  |--[ek]              Directory containing EK files.
   |  |  |
   |  |  +-- ekinfo.txt    Description of files in the data/ek directory.
   |  |
   |  |--[fk]              Directory containing FK file(s).
   |  |  |
   |  |  |-- fkinfo.txt    Description of files in the data/fk directory.
   |  |  |-- *.tf          FK file(s).
   |  |  +-- *.lbl         PDS labels for FK files.
   |  |
   |  |--[ik]              Directory containing IK files.
   |  |  |
   |  |  |-- ikinfo.txt    Description of files in the data/ik directory.
   |  |  |-- *.ti          IK files.
   |  |  +-- *.lbl         PDS labels for IK files.
   |  |
   |  |--[lsk]             Directory containing LSK files.
   |  |  |
   |  |  |-- lskinfo.txt   Description of files in the data/lsk directory.
   |  |  |-- *.tls         LSK file(s).
   |  |  +-- *.lbl         PDS labels for LSK files.
   |  |
   |  |--[pck]             Directory containing PCK file(s).
   |  |  |
   |  |  |-- pckinfo.txt   Description of files in the data/pck directory.
   |  |  |-- *.tpc         Text PCK file(s).
   |  |  +-- *.lbl         PDS labels for PCK files.
   |  |
   |  |--[sclk]            Directory containing SCLK file(s).
   |  |  |
   |  |  |-- sclkinfo.txt  Description of files in the data/sclk directory.
   |  |  |-- *.tsc         SCLK file(s).
   |  |  +-- *.lbl         PDS labels for SCLK files.
   |  |
   |  +--[spk]             Directory containing SPK files.
   |     |
   |     |-- spkinfo.txt   Description of files in the data/spk directory.
   |     |-- *.bsp         SPK files.
   |     +-- *.lbl         PDS labels for SPK files.
   |--[document]           Directory containing volume related documents.
   |  |
   |  |-- docinfo.txt      Description of files in the document directory.
   |  |-- onlabels.txt     Description of PDS labels for SPICE kernels.
   |  +-- lblinfo.txt      Description of PDS label location in this volume.
   |--[extras]             Directory containing extra data elements.
   |  |
   |  |-- extrinfo.txt     Description of files and directories in extras.
   |  |
   |  +--[mk]              Directory containing meta-kernels.
   |  |  |
   |  |  |-- mkinfo.txt    Description of meta-kernel files.
   |  |  +-- *.tm          Meta-kernel files.
   |  |
   |  +--[orbnum]          Directory containing orbit number files.
   |     |
   |     |-- orbinfo.txt   Description of orbit number files.
   |     +-- *.orb         Orbit number files.
   |--[index]              Directory containing index files.
   |  |
   |  |-- indxinfo.txt     Description of files in the index directory.
   |  |--     Table of MD5 checksums for files in this data set.
   |  |-- checksum.lbl     PDS label for file.
   |  |--        Index table of SPICE kernels on this volume.
   |  +-- index.lbl        PDS label for file.
      +-- softinfo.txt     Instructions on how to obtain SPICE software.

Whom to Contact for Information

   Institute of Space and Astronautical Science (ISAS),
   Japan Aerospace Exploration Agency (JAXA)
   3-1-1 Yoshinodai, Chuo-ku, Sagamihara-shi,
   Kanagawa 252-5210, Japan
   WWW Site:
   Electronic mail address:

   PDS Navigation and Ancillary Information Facility (NAIF),
   MAIL STOP 301-121
   Jet Propulsion Laboratory
   California Institute of Technology
   4800 Oak Grove Drive
   Pasadena, CA, 91109-8099
   WWW Site:
   Electronic mail address:

Cognizant Persons

   This archive was designed and produced by Shin-ya Murakami,
   Yukio Yamamoto, and Kevin McGouldrick.