KPL/PCK

SPICE PCK File for Hartley 2 -- DIF-C-HRIV/MRI-5-HARTLEY2-SHAPE-V1.0 Values   
===========================================================================
 
     By: B. Semenov                                24-JAN-2023
 
 
Organization
--------------------------------------------------------
 
     The sections of this file are as follows.
 
     Introductory Information:
 
         --   Version description
 
         --   Disclaimer
 
         --   Sources
 
     Pck Data:
 
         --   Orientation constants for Comet 103P/Hartley 2 (1986 E2)
 
         --   Radii for Comet 103P/Hartley 2 (1986 E2)
 
 
Version description
--------------------------------------------------------
 
     This file was created by Boris Semenov, NAIF/JPL on January 24, 2023.
     
 
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 `by line' and date if you modify
     the file.
 
 
Sources
--------------------------------------------------------
 
     The sources for the constants listed in this file are:
 
        1) Farnham, T.L. and Thomas, P.C., PLATE SHAPE MODEL OF COMET 
           103P/HARTLEY 2 V1.0, DIF-C-HRIV/MRI-5-HARTLEY2-SHAPE-V1.0,                                  
           NASA Planetary Data System, 2013; https://pdssbn.astro.umd.edu/
           holdings/dif-c-hriv_mri-5-hartley2-shape-v1.0/catalog/dataset.cat 

        2) Generic PCK file pck00011.tpc based on IAU 2015 constants;
           https://naif.jpl.nasa.gov/pub/naif/generic_kernels/pck/pck00011.tpc


Orientation constants for Comet 103P/Hartley 2 (1986 E2)
--------------------------------------------------------
 
     This PCK implements inertially-fixed Hartley 2 orientation based 
     on these principal axes directions and time from [1]:

        Time of Closest Approach:  2010-11-04T13:59:47.7                            
        Directions of Axes at Closest Approach:                                     
                                          RA (deg)  Dec (deg) (J2000)         
                       +Z (Long) axis:    226.12     39.37                    
                       +X axis:           237.10    -50.10                    
                       +Y Axis:           320.59      5.42                    

     The rotation angles provided in the keywords below were derived as 
     follows:

        call latrec( 1, 226.12/dpr(), 39.37/dpr(), zj )
        call latrec( 1, 237.10/dpr(), -50.10/dpr(), xj )
        call twovec( zj, 3, xj, 1, mj2bf )
        call m2eul ( mj2bf, 3, 1, 3, r3, r2, r1 )
        print (r3+twopi())*dpr(), (pi()/2-r2)*dpr(), (r1-pi()/2+twopi())*dpr()

                 277.01761927         39.37000000        226.12000000

     \begindata
 
        BODY1000041_POLE_RA  = (   226.12   0.0  0.0 )
        BODY1000041_POLE_DEC = (    39.37   0.0  0.0 )
        BODY1000041_PM       = (   277.0176 0.0  0.0 )

        BODY1000041_CONSTANTS_JED_EPOCH = ( 2455505.0839569741 )

     \begintext


Radii for Comet 103P/Hartley 2 (1986 E2)
--------------------------------------------------------

     For completeness, the radii provided in the keyword below were copied 
     from comments in [2].

     \begindata
 
        BODY1000041_RADII    = ( 0.34   0.34   1.16 )
 
     \begintext

End of PCK file.