Procedure

     SPKR14 ( Read SPK record from segment, type 14 )

     SUBROUTINE SPKR14 ( HANDLE, DESCR, ET, RECORD )

Abstract

     Read a single data record from a type 14 SPK segment.

Required_Reading

     SPK

Keywords

     EPHEMERIS

Declarations

     IMPLICIT NONE

     INTEGER               HANDLE
     DOUBLE PRECISION      DESCR    ( * )
     DOUBLE PRECISION      ET
     DOUBLE PRECISION      RECORD   ( * )

Brief_I/O

     VARIABLE  I/O  DESCRIPTION
     --------  ---  --------------------------------------------------
     HANDLE     I   Handle of the open SPK file.
     DESCR      I   Descriptor of the segment with the desired record.
     ET         I   Epoch used to identify the desired record.
     RECORD     O   The desired type 14 SPK record.

Detailed_Input

     HANDLE   is the handle of the open SPK file which contains the
              segment of interest.

     DESCR    is the descriptor for a type 14 SPK segment that contains
              the record of interest.

     ET       is the target epoch used to determine the particular
              record to be obtained from the SPK segment.

Detailed_Output

     RECORD   is the record from the specified segment which,
              when evaluated at epoch ET, will give the state
              (position and velocity) of some body, relative
              to some center, in some inertial reference frame.

Parameters

     None.

Exceptions

     1)  It is assumed that the descriptor and handle supplied are
         for a properly constructed type 14 segment. No checks are
         performed to ensure this.

     2)  If the input ET value is not within the range specified
         in the segment descriptor, the error SPICE(TIMEOUTOFBOUNDS)
         is signaled.

     3)  If any other error occurs while looking up SPK data, the error
         is signaled by a routine in the call tree of this routine.

Files

     See argument HANDLE.

Particulars

     This subroutine will read a single record from a type 14 SPK
     segment. The record read will provide the data necessary to
     compute the state for a some body in some inertial frame at epoch
     ET.

     See the SPK Required Reading file for a description of the
     structure of a type 14 SPK segment.

Examples

     The data returned by the SPKRnn routine is in a raw form, taken
     directly from the segment. As such, it will be not be directly
     useful to a user unless they have a complete understanding of the
     structure of the data type. Given that understanding, however,
     the SPKRnn routines could be used to "dump" and check segment data
     for a particular epoch, as in the example which follows.


     C
     C     Get a segment applicable to a specified body and epoch.
     C
           CALL SPKSFS ( BODY, ET, HANDLE, DESCR, IDENT, FOUND )

     C
     C     Look at parts of the descriptor.
     C
           CALL DAFUS ( DESCR, 2, 6, DCD, ICD )
           CENTER = ICD( 2 )
           REF    = ICD( 3 )
           TYPE   = ICD( 4 )

           IF ( TYPE .EQ. 14 ) THEN
              CALL SPKR14 ( HANDLE, DESCR, ET, RECORD )
                  .
                  .  Look at the RECORD data.
                  .
           END IF

Restrictions

     1)  This subroutine should not be called directly by a casual
         user. It is intended for use by the subroutine SPKPV, and
         certain tests for error conditions are not performed here, as
         SPKPV will have already performed them.

Literature_References

     None.

Author_and_Institution

     J. Diaz del Rio    (ODC Space)
     K.R. Gehringer     (JPL)

Version

    SPICELIB Version 1.0.1, 14-APR-2021 (JDR)

        Added IMPLICIT NONE statement.

        Edited the header to comply with NAIF standard. Updated entry
        #3 in $Exceptions section. Moved SPK required reading from
        $Literature_References to $Required_Reading section.

    SPICELIB Version 1.0.0, 10-MAR-1995 (KRG)