KPL/PCK

Asteroid 21 Lutetia PCK File -- RSOC Solution
===========================================================================

 
Version and Date
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     Version 0.0 -- October 28, 2009 -- J. Vazquez, MIG, SRE-OS/ESA
 
 
Organization
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     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
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     This is a PCK containing values for the pole orientation, 
     rotation period and shape obtained from [2].
     
 
Disclaimer
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     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. MIG suggests that you inspect this file visually
     before proceeding with any critical or extended data processing.
 
     MIG requests that you update the version section if you modify
     the file.
 
 
Sources
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     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) 'PTB MAPPS Requirements Specification Cruise Phase' (Jun 6, 2008),
           (RO-SGS-RS-0001), version 1a.


Orientation constants for Asteroid 21 Lutetia
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     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 [2] the asteroid pole direction is specified by the 
     following ecliptic right ascension (RA) and declination (DEC):

        RA  =  51.4 deg.
        DEC =  -4.4 deg.

     These parameters correspond to the following in the J2000 equatorial 
     frame:

        RA  =  50.156 deg.
        DEC =  13.861 deg.

     The W1 term was set to correspond to the period of 8.16827267 hours,
     and the W0 term is 94.2 deg ([2]).
     
     W0 is defined as the offset (angle measured along the equator in an easterly 
     direction from the intersection with the Earth's mean equator to the intersection 
     with the prime meridian) at a 0 seconds ET.
 
     \begindata
 
        BODY2000021_POLE_RA             = (  50.156     0.0         0.0 )
        BODY2000021_POLE_DEC            = (  13.861     0.0         0.0 )
        BODY2000021_PM                  = (  94.2    1057.75117324  0.0 )
 
     \begintext


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

          a/b/c = 130km/100km/90km

     provided in [2].
 
     \begindata
 
        BODY2000021_RADII               = ( 65.0  50.0  45.0 )
 
     \begintext


Albedo Values for Asteroid 21 Lutetia
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     No values for the albedo are provided in [2].