KPL/PCK

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

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

     Version 0.3 -- September 26, 2011 -- J. Vazquez, PSA, SRE-OS/ESA
     
        Updated values for the rotational period.

     Version 0.2 -- September 23, 2011 -- J. Vazquez, PSA, SRE-OS/ESA
        
        Updated values for the orientation of the north pole.
        
     Version 0.1 -- October 28, 2009 -- J. Vazquez, MIG, SRE-OS/ESA
 
 
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 PCK containing values for the pole orientation, 
     rotation period and shape obtained from [2].
     
 
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. 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
--------------------------------------------------------
 
     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.
        
        3) Rotational Parameters of (21) Lutetia, L. Jorda & J.-B. Vincent


Orientation constants for Asteroid 21 Lutetia
--------------------------------------------------------
 
     Right Ascension and Declination for the north pole of the asteroid are taken
     from [3]. The W1 term was set to correspond to the period of 8.168270 hours ([3]).
     This way, the rotational parameters of this ellipsoidal model math the ones in
     the paper from Jorda and Vincent ([3]).
     
     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             = (  51.80      0.0         0.0 )
        BODY2000021_POLE_DEC            = (  10.83      0.0         0.0 )
        BODY2000021_PM                  = (  94.2    1057.751519    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/100km/90km

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


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

     No values for the albedo are provided in [2].