KPL/PCK

Asteroid Vesta P_constants (PcK) SPICE kernel file -- GRV221108 Solution
===========================================================================


Overview
--------------------------------------------------------

   This PCK provides Vesta rotation constants determined in 2022 by the
   DAWN Gravity Team, JPL in the process of deriving their Vesta 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 26, 2025 -- Boris Semenov

      Updated comments and formatting. No changes to data.

   Version 0.0 -- November 16, 2023 -- Ryan Park


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

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


References
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   Park, R. S., Ermakov, A. I., Konopliv, A. S., et al. A small core
   in Vesta inferred by Dawn's observations. Nat Astron (2025).
   https://doi.org/10.1038/s41550-025-02533-7


Orientation constants for asteroid Vesta
--------------------------------------------------------

   The inertial reference frame for Vesta constants is J2000; this is
   the default reference frame for PCK orientation data.

   The Vesta rotation frame is consistent with the IAU definition where
   the ``Claudia Double-Prime'' defines the prime meridian.

   The epoch of the constants is J2000; this is Julian ephemeris date
   (JED) 2451545.0.

   The NAIF integer code for Vesta is 2000004. 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 Vesta DSKs produced by the DAWN Gravity team in November
   2022.

      \begindata

         BODY2000004_POLE_RA          = (   309.06109533038847
                                             -0.2252128522309539
                                              0.0002980197183368481        )

         BODY2000004_POLE_DEC         = (    42.23238610238792
                                             -0.0521838177833105
                                              0.0001118346176992791        )

         BODY2000004_PM               = (   284.643097580454
                                           1617.333129223909
                                              5.2334553e-12                )

         BODY2000004_NUT_PREC_ANGLES  = (    26.566509485 19838.878002637
                                           168.026198470   9919.202187455
                                             5.055575123  29758.039028106
                                           -15.607636417  39676.994986013
                                          -159.442877134  19838.866373438
                                            58.798564366   9919.394190215
                                          -179.720293586  29758.046461662
                                           159.974278450  39677.008537217
                                           206.939195799  19836.803624310
                                           -11.010108055   9916.079099222
                                           187.554206944  29746.219709751  )

         BODY2000004_NUT_PREC_RA      = (    0.000658148       0.000377107
                                             0.000138933       0.000022700
                                             0.                0.
                                             0.                0.
                                             0.                0.
                                             0.                            )

         BODY2000004_NUT_PREC_DEC     = (    0.                0.
                                             0.                0.
                                             0.000540323       0.000126657
                                             0.000113727       0.000018566
                                             0.                0.
                                             0.                            )

         BODY2000004_NUT_PREC_PM      = (    0.                0.
                                             0.                0.
                                             0.                0.
                                             0.                0.
                                             0.000443671       0.000252070
                                             0.000092872                   )


      \begintext


Radii for asteroid Vesta
--------------------------------------------------------

   These Vesta radii are consistent with the Vesta DSKs produced by the
   DAWN Gravity team in November 2022.

      \begindata

         BODY2000004_RADII             = ( 284.62   277.24   226.33 )

      \begintext


GM for asteroid Vesta
--------------------------------------------------------

   This GM value is consistent with the Vesta DSKs produced by the DAWN
   Gravity team in November 2022.

      \begindata

         BODY2000004_GM                = ( 17.2882844 )

      \begintext


End of PCK file.