PDS_VERSION_ID      = PDS3
RECORD_TYPE         = STREAM

OBJECT     = TEXT
  PUBLICATION_DATE = 2015-10-09
  NOTE             = "Description of the GEOMETRY directory contents for
                      MESSENGER archive volumes"
END_OBJECT = TEXT

END

All MESSENGER geometry data are contained in a separate data set. This data
set was cumulatively delivered in conjunction with each archive delivery
as described in the MESSENGER Data Management and Archiving Plan (DMAP). This
data set contains geometry data in the form of SPICE kernels. The data set is
archived by the PDS NAIF Node in the messsp_1000 volume, PDS data set ID
mess-e/v/h/spice-6-v1.0. It is available from the NAIF online archives at
http://naif.jpl.nasa.gov.

The SPICE data sets contain:
----------------------------

.ti  (ik)   -- SPICE system for providing instrument field of view
               definitions and other ancillary data.

.bc  (ck)   -- SPICE system for providing attitude information for
               spacecraft and instrument platforms.

.tpc (pck)  -- Planetary constants kernels. Models used for rotations of
               solar system bodies and shapes (constants and matrices of
               planets and satellites). Includes mission specific overlay
               for Mercury shape.

.tf  (fk)   -- MESSENGER reference frame file. Also known as the Frames
               Kernel. Contains the MESSENGER spacecraft, science
               instrument, and communications antennae frame definitions.

.tls (lsk)  -- Leapsecond kernel for providing information to convert
               between UTC times and any other time system.

.bsp (spk)  -- MESSENGER spacecraft ephemeris file. Also known as the
               Planetary Spacecraft Ephemeris Kernel (SPK) file.

.tsc (sclk) -- MESSENGER spacecraft clock coefficients file. Also known as
               the Spacecraft clock kernel (SCLK) file. Models the
               spacecraft clock against the Terrestrial Dynamical Time (TDT)
               time system.