KPL/PCK

Asteroid Ceres P_constants (PcK) SPICE kernel file -- GRV171219 Solution
===========================================================================


Overview
--------------------------------------------------------
     
   This PCK provides Ceres rotation constants determined in 2017 by the
   DAWN Gravity Team, JPL in the process of deriving their HAMO and
   LAMO Ceres shape and gravity models.

 
Disclaimer
--------------------------------------------------------
 
   This constants file may not contain the parameter values that you
   prefer. Note that this file may be readily modified by you or anyone
   else. NAIF suggests that you inspect this file visually before
   proceeding with any critical or extended data processing.
 
   NAIF requests that you update the ``Version Description'' section if
   you modify the file.


Version Description
--------------------------------------------------------
 
   Version 1.0 -- March 29, 2018 -- Boris Semenov

      Updated comments. No changes to data.

   Version 0.0 -- January 5, 2018 -- Ryan Park


Contact Information
--------------------------------------------------------

   Ryan Park, ryan.s.park@jpl.nasa.gov


References
--------------------------------------------------------

   Park et al., High-resolution topography of Ceres from
   stereophotoclinometry using Dawn Imaging Data, submitted.
 
   Konopliv et al., The Ceres Gravity Field, Spin Pole, Rotation Period
   and Orbit from the Dawn Radiometric Tracking and Optical Data,
   Icarus, 299, 411-429, 2017.
 
   Park et al., A partially differentiated interior for Ceres deduced
   from its gravity field and shape, Nature, 538, 515-517, 2016,
   doi:10.1038/nature18955.


Orientation constants for asteroid Ceres
--------------------------------------------------------
 
   The inertial reference frame for Ceres constants is J2000; this is
   the default reference frame for PCK orientation data.
 
   The epoch of the constants is J2000; this is Julian ephemeris date
   (JED) 2451545.0.
 
   The NAIF integer code for Ceres is 2000001. See the NAIF_IDs
   required reading for further information on NAIF integer codes.

   These rotation constants were used to produce and are consistent
   with the Ceres DSKs produced by the DAWN Gravity team in December
   2017.

      \begindata
 
         BODY2000001_POLE_RA    = ( 291.4276255014905   0.0              0.0 )
         BODY2000001_POLE_DEC   = (  66.7603339758718   0.0              0.0 )
         BODY2000001_PM         = ( 170.3090838323758 952.1532635208473  0.0 )

      \begintext


Radii for asteroid Ceres
--------------------------------------------------------
     
   These Ceres radii are consistent with the Ceres DSKs produced by the
   DAWN Gravity team in December 2017.

      \begindata
 
         BODY2000001_RADII      = ( 482.10    482.10    445.94 )
 
      \begintext


GM for asteroid Ceres
--------------------------------------------------------

   This GM value is consistent with the Ceres DSKs produced by the DAWN
   Gravity team in December 2017.

      \begindata

         BODY2000001_GM         = (  62.6290536056 )
 
      \begintext

End of PCK file.