KPL/PCK

Asteroid 2867 Steins PCK File
===========================================================================
 

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

     Version 0.2 -- March 28, 2006 -- Boris Semenov, NAIF
 
        Updated radii based on [4]. Added albedo based on [5].

     Version 0.1 -- March 22, 2006 -- Boris Semenov, NAIF
 
        Updated 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 Asteroid 2867 Steins
 
         --   Radii for Asteroid 2867 Steins
 
 
Version description
--------------------------------------------------------
     
     This is a preliminary PCK containing draft values for the shape
     and rotation period obtained from [1] and placeholder values for
     pole direction (set to line up with the ecliptic north pole in
     J2000 coordinates.)

 
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) N/A.

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

        4) E-mail from Antonella Barucci, March 24, 2006.

        5) "First Albedo Determination of 2867 Steins", Fornasier S.,
           Belskaya I., Fulchignoni M., Bacurri M.A., Barbieri C.,
           March 14, 2006 presentation for Rosetta SWT.

 
Orientation constants for Asteroid 2867 Steins
-------------------------------------------------------- 
 
     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 2867 Steins is 2002867. See the NAIF_IDs
     required reading for further information on NAIF integer codes.
 
     The pole has been arbitrarily chosen to point toward ecliptic
     north at the J2000 epoch. The RA and DEC below are those of the
     ecliptic north pole in J2000 coordinates.
 
     The W1 term was set to correspond to the period of 6.06 +/- 0.05 hours
     ([3]). The W0 term is arbitrarily set to 0.
 
     \begindata
 
        BODY2002867_POLE_RA    = ( 270.0           0.0          0.0 )
        BODY2002867_POLE_DEC   = (  66.560709      0.0          0.0 )
        BODY2002867_PM         = (   0.0        1425.74257426   0.0 )
 
     \begintext
 
     
Radii for Asteroid 2867 Steins
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     The radii provided in the keyword below are set to 5 km as 
     specified in [4].
 
     \begindata
 
        BODY2002867_RADII      = ( 5.0  5.0  5.0 )
 
     \begintext


Albedo Values for Asteroid 2867 Steins
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    The albedo provided in the keywords below is taken from [5].
 
    \begindata
 
       BODY2002867_ALBEDO_POLARIMETRIC  = 0.45
 
    \begintext