KPL/PCK

Asteroid 21 Lutetia PCK File -- Lightcurves Pole Solution 2
===========================================================================

 
Version and Date
--------------------------------------------------------

     Version 0.2 -- March 28, 2006 -- Boris Semenov, NAIF
 
        Added albedo data from [3]. Split file into four different
        files each containing a particular pole solution from [3].

     Version 0.1 -- March 22, 2006 -- Boris Semenov, NAIF
 
        Updated pole orientation constants, rotation period and radii
        based on [3].

     Version 0.0 -- August 13, 2004 -- Boris Semenov, NAIF
 
 
Organization
--------------------------------------------------------
 
     The sections of this file are as follows.
 
     Introductory Information:
 
         --   Version description
 
         --   Disclaimer
 
         --   Sources
 
     Pck Data:
 
         --   Orientation constants for Asteroid 21 Lutetia
 
         --   Radii for Asteroid 21 Lutetia
 
 
Version description
--------------------------------------------------------
 
     This is a preliminary PCK containing draft values for the pole
     orientation, rotation period and shape obtained from [3].
     
 
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 section if you modify
     the file.
 
 
Sources
--------------------------------------------------------
 
     The sources for the constants listed in this file are:
 
        1) ESA Science and Technology Server, Rosetta area,
           http://sci.esa.int/science-e/www/object/index.cfm?
           fobjectid=34849

        2) JPL/HORIZONS Comet and Asteroid database

        3) "The Rosetta Asteroid Targets", M. A. Barucci, Padova
           31/01/2006


Orientation constants for Asteroid 21 Lutetia
--------------------------------------------------------
 
     The inertial reference frame for these 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 Asteroid 21 Lutetia is 2000021. See the
     NAIF_IDs required reading for further information on NAIF integer
     codes.
 
     According to lightcurves solution 2 provided in [3] the asteroid
     pole direction is specified by the following ecliptic longitude
     and latitude:

        lon =  39 +/- 10 deg.
        lat =   3 +/- 10 deg.

     The W1 term was set to correspond to the period of 8.17 +/- 0.01 hours
     ([3]). The W0 term is arbitrarily set to 0.
 
     \begindata
 
        BODY2000021_POLE_RA             = (  35.60788046    0.0         0.0 )
        BODY2000021_POLE_DEC            = (  17.33772863    0.0         0.0 )
        BODY2000021_PM                  = (   0.0        1057.52753978  0.0 )
 
     \begintext


Radii for Asteroid 21 Lutetia
--------------------------------------------------------
     
     The radii provided in the keyword below correspond to the 
     following asteroid shape

          a/b/c = 130km/104km/74km

     provided in [3].
 
     \begindata
 
        BODY2000021_RADII               = ( 65.0  52.0  37.0 )
 
     \begintext


Albedo Values for Asteroid 21 Lutetia
--------------------------------------------------------

    The albedos provided in the keywords below resulted from several
    different observation campaigns using different instrumentation and
    different wavelength. The individual values are taken from [3].

    \begindata

       BODY2000021_ALBEDO_IRAS          = 0.22
       BODY2000021_ALBEDO_RADAR         = 0.17
       BODY2000021_ALBEDO_RADIOMETRIC   = 0.11
       BODY2000021_ALBEDO_POLARIMETRIC  = 0.09

    \begintext