PDS_VERSION_ID                = PDS3                                          
RECORD_TYPE                   = STREAM                                        
OBJECT                        = TEXT                                          
  PUBLICATION_DATE            = 2008-02-22                                    
  NOTE                        = "                                             
                                                                              
  This file is the current NH SDC SPICE Instrument                            
  Kernel with an attached PDS label prepended to it.  It is only              
  provided as a convenience to the user, As such, it is a trivial             
  text file not meant to be relocatable with the archive which is             
  why it does not have a detached PDS label.  Furthermore, is not             
  likely to be updated in a timely fashion as part of any SPICE               
  kernel updates, and should therefore not be used as a SPICE kernel          
  in any scientific investigation.                                            
                                                                              
  - This file is included in the /DOCUMENT/ directory of most if not          
    all volumes for this instrument as a convenience to the user              
    because it documents the geometry of the SDC instrument                   
    Field(s) Of View (FOV(s)).  As such, and also because it is not           
    likely to be updated in a timely fashion as                               
                                                                              
  - The original name of the source of this file was                          
                                                                              
      NH_SDC_V###.TI                                                          
                                                                              
    where ### is a version number.                                            
                                                                              
  - The format of this file, starting five lines after this                   
    TEXT OBJECT, is a SPICE Kernel Pool text file                             
                                                                              
    - The Instrument Kernel itself is (or will be) formally archived          
      with the New Horizons SPICE dataset.                                    
                                                                              
    - See the SPICE documentation for details of that format                  
                                                                              
      - http://naif.jpl.nasa.gov/                                             
                                                                              
    - Even without understanding that format, the Instrument Kernel,          
      and especially its comments, are human readable.  Comments are          
      any line for which one of the following three statements is true:       
                                                                              
      1) The line is before the first data marker line in the file            
      2) The line is in a section of lines between a text marker line and     
         a data marker line with no intervening text or data marker lines     
      3) The line is in a section of lines between the last text marker and   
         the end of the file with no intervening text or data marker lines    
                                                                              
      - a data marker line has the single token '\begindata' on it with       
        all other characters on the line being whitespace                     
                                                                              
      - a text marker line has the single token '\begintext' on it with       
        all other characters on the line being whitespace                     
                                                                              
    - N.B. Because padding and a carriage return have been added to           
           each line of this file, it may or may not be functional            
           as a valid SPICE kernel.                                           
"                                                                             
END_OBJECT                    = TEXT                                          
END                                                                           
########################################################################      
##################### SPICE IK Starts after next line ##################      
########################################################################      
KPL/IK                                                                        
                                                                              
                                                                              
SDC Instrument Kernel                                                         
==============================================================================
                                                                              
   This instrument kernel (I-kernel) contains references to the mounting      
   alignment, internal and FOV geometry for the New Horizons Student Dust     
   Counter (SDC) instrument.                                                  
                                                                              
                                                                              
Version and Date                                                              
----------------------------------------------------------                    
                                                                              
   The TEXT_KERNEL_ID stores version information of loaded project text       
   kernels. Each entry associated with the keyword is a string that consists  
   of four parts: the kernel name, version, entry date, and type. For example,
   the SDC I-kernel might have an entry as follows:                           
                                                                              
         TEXT_KERNEL_ID += 'NEWHORIZONS_SDC V1.0.0 22-FEBRUARY-2007 IK'       
                                    |           |        |          |         
                                    |           |        |          |         
                KERNEL NAME <-------+           |        |          |         
                                                |        |          V         
                                VERSION <-------+        |     KERNEL TYPE    
                                                         |                    
                                                         V                    
                                                    ENTRY DATE                
                                                                              
   SDC I-Kernel Version:                                                      
                                                                              
           \begindata                                                         
                                                                              
           TEXT_KERNEL_ID += 'NEWHORIZONS_SDC V1.0.0 22-FEBRUARY-2007 IK'     
                                                                              
           NAIF_BODY_NAME += ( 'NH_SDC' )                                     
           NAIF_BODY_CODE += ( -98700 )                                       
                                                                              
           \begintext                                                         
                                                                              
   Version 1.0.0 -- February 22, 2007 -- Lillian Nguyen                       
                                                                              
            --   Defined a celestial position angle reference vector.         
            --   Promoting to version 1.0.0 denoting approval of kernel set   
                 by instrument teams.                                         
                                                                              
   Version 0.0.1 -- January 15, 2006 -- Lillian Nguyen                        
                                                                              
            --   Draft Version. NOT YET APPROVED BY INSTRUMENT TEAM.          
            --   Added field of view diagram.                                 
                                                                              
   Version 0.0.0 -- January 15, 2006 -- Lillian Nguyen                        
                                                                              
            --   Draft Version. NOT YET APPROVED BY INSTRUMENT TEAM.          
                                                                              
                                                                              
References                                                                    
----------------------------------------------------------                    
                                                                              
            1.   New Horizons Spacecraft to SDC Interface Control Document,   
                 7399-9050 Rev A.                                             
                                                                              
            2. ``Kernel Pool Required Reading''                               
                                                                              
            4.   APL New Horizons web site,                                   
                 http://pluto.jhuapl.edu/spacecraft/overview.html.            
                                                                              
            5.   E-mail exchange with David James (Laboratory for Atmospheric 
                 and Space Physics at the University of Colorado (LASP)),     
                 Jan. 26, 2006 - Feb. 1, 2006.                                
                                                                              
            6.   New Horizons Spacecraft Frames Kernel.                       
                                                                              
                                                                              
Contact Information                                                           
----------------------------------------------------------                    
                                                                              
   Lillian Nguyen, JHU/APL, (443)-778-5477, Lillian.Nguyen@jhuapl.edu         
                                                                              
                                                                              
Implementation Notes                                                          
----------------------------------------------------------                    
                                                                              
   This file is used by the SPICE system as follows: programs that make use of
   this instrument kernel must ``load'' the kernel, normally during program   
   initialization. Loading the kernel associates data items with their names  
   in a data structure called the ``kernel pool''. The SPICELIB routine       
FURNSH,                                                                       
   CSPICE routine furnsh_c, and IDL routine cspice_furnsh load SPICE kernels  
   as shown below:                                                            
                                                                              
   FORTRAN (SPICELIB)                                                         
                                                                              
           CALL FURNSH ( 'kernel_name' )                                      
                                                                              
   C (CSPICE)                                                                 
                                                                              
           furnsh_c ( "kernel_name" )                                         
                                                                              
   ICY (IDL)                                                                  
                                                                              
           cspice_furnsh, 'kernel_name'                                       
                                                                              
   In order for a program or subroutine to extract data from the pool, the    
   SPICELIB routines GDPOOL, GCPOOL, and GIPOOL are used. See [2] for details.
                                                                              
   This file was created and may be updated with a text editor or word        
   processor.                                                                 
                                                                              
                                                                              
Naming Conventions                                                            
----------------------------------------------------------                    
                                                                              
   All names referencing values in this I-kernel start with the characters    
   `INS' followed by the NAIF New Horizons spacecraft ID number (-98)         
   followed by a NAIF three digit ID code for the ALICE instrument.           
                                                                              
   The remainder of the name is an underscore character followed by the unique
   name of the data item.  For example, the SDC boresight direction in the    
   SDC frame (``NH_SDC'' -- see [6] ) is specified by:                        
                                                                              
           INS-98700_BORESIGHT                                                
                                                                              
   The upper bound on the length of the name of any data item is 32           
   characters.                                                                
                                                                              
   If the same item is included in more than one file, or if the same item    
   appears more than once within a single file, the latest value supersedes   
   any earlier values.                                                        
                                                                              
                                                                              
SDC description                                                               
----------------------------------------------------------                    
                                                                              
   From [4]:                                                                  
                                                                              
   ``The Student Dust Counter (SDC) will count and measure the sizes of dust  
   particles along New Horizons' entire trajectory, which covers regions of   
   interplanetary space never before sampled. Such dust particles are created 
   by comets shedding material and Kuiper Belt Objects colliding with one     
   another. The SDC is managed and was built primarily by students at the     
   University of Colorado in Boulder, with supervision from professional      
   space scientists.''                                                        
                                                                              
   From [1]:                                                                  
                                                                              
   ``The SDC's primary goal is to map the dust distribution from 1 to 50 AU   
   in our solar system.  Its secondary goal is to detect the putative dust    
   ring/halo at Pluto.  To do this, it uses detector patches consisting of    
   permanently polarized polyvinylidine fluoride (PVDF) thin film.  A dust    
   grain that penetrates this film generates a de-polarization charge in the  
   film whose amplitude is a function of the grain's mass and velocity.       
   [This is adapted from an undated LASP document entitled "The Student Dust  
   Counter Experiment"].''                                                    
                                                                              
                                                                              
SDC Field of View Parameters                                                  
----------------------------------------------------------                    
                                                                              
   The SDC frame is defined such that the boresight is the instrument Z axis. 
   From [5], the field of view is circular with a 180 degree angular          
   separation. The field of view can also be described as the half-space      
   given in instrument coordinates by Z > 0. In the following diagram, the    
   field of view is the entire half-space to the right of the XY plane.       
                                                                              
                                                                              
                  Y    ^                                                      
                   ins |                                                      
                       |                                                      
                       |                                                      
                       |                                                      
                       |-.  90 deg                                            
                       |  `                                                   
               +X (in) x---'-----------> +Z                                   
                 ins   |                   ins                                
                       |                                                      
                       |                                                      
                       |                                                      
                       |                                                      
                       |                                                      
                       V                                                      
                                                                              
                                                                              
   Because the SDC field of view is circular, the FOV reference vector        
(keyword                                                                      
   FOV_REF_VECTOR) is any vector with a component that lies in a plane normal 
   to the field of view boresight. We chose the +Y axis of the instrument     
   frame. These FOV values are given in the keywords below:                   
                                                                              
           \begindata                                                         
                                                                              
           INS-98700_FOV_FRAME                 = 'NH_SDC'                     
           INS-98700_FOV_SHAPE                 = 'CIRCLE'                     
           INS-98700_BORESIGHT                 = ( 0.0, 0.0, 1.0 )            
           INS-98700_FOV_CLASS_SPEC            = 'ANGLES'                     
           INS-98700_FOV_REF_VECTOR            = ( 0.0, 1.0, 0.0 )            
           INS-98700_FOV_REF_ANGLE             = ( 90.0 )                     
           INS-98700_FOV_ANGLE_UNITS           = 'DEGREES'                    
                                                                              
           \begintext                                                         
                                                                              
   Also defined here is the celestial position angle reference vector. This   
   vector defines the position angle, or angle from celestial north (and      
   passing through celestial east) to the reference vector.                   
                                                                              
           \begindata                                                         
                                                                              
           INS-98700_REFERENCE_VECTOR  = ( 1.0, 0.0, 0.0 )                    
                                                                              
           \begintext                                                         
                                                                              
                                                                              
