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!
! SDDL Name:	AST_JITTER_KW.SDDL
!
! Purpose:      This SDDL file defines the AST_JITTER_KW relation.
!
! Modification History:
!
!   Date       OPR      Who                       Reason
! --------   -------    ----   ------------------------------------------------
! 03/12/01    44862     Baum   Original implementation
!
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!
!
 
LANGUAGE	SQL

RECORD  AST_JITTER_KW_TYPE
 
!------------------------------------------------------------------------------
!
!   RECORD INFORMATION
!
!------------------------------------------------------------------------------
 
 
DESCRIPTION       "This relation is used to provide data calculted by the
                   JITTER process to the AST pipeline. The data is in the form
                   of named keyword values. For flexibility, this table allows
                   an arbitrary number of keywords to be accessed by the
                   programmattic IDs of the astrometry dataset. "

!------------------------------------------------------------------------------
!
!   FIELD INFORMATION
!
!------------------------------------------------------------------------------

    FIELD program_id
        TYPE        C3
        UNITS	    "BASE_36"
        DESCRIPTION "When a proposal is accepted into the PMDB by SPSS it must
		    be assigned a unique 3 character base 36 program identifier.
		    This is done by the PMDB/ACCEPT_PROP command.
                    It is used for identification of proposals by spacecraft 
                    and OPUS software. It is also used in the OPUS and DADS 
                    rootname for all archived science data files. 
                    Because of flight design software, program_id must be
                    three characters. "
    END_FIELD

    FIELD obset_id
        TYPE        C2
        UNITS	    "BASE_36"
        DESCRIPTION "An observation set is a collection of one or more 
		    alignments that are grouped together based on FGS pointing 
		    requirements.  That is, if multiple alignments can all be 
		    executed using the same guide star pair, they are grouped
		    into the same observation set. "
    END_FIELD

    FIELD ob_number
        TYPE        C2
        UNITS	    "BASE_36"
        DESCRIPTION "Observations are numbered sequentially throughout
                    an observation set and are assigned by SMS/Gen.
                    An ob_number is _NOT_ the same as an obset_ID. "
    END_FIELD

    FIELD keyword_name
        TYPE        C8
        DESCRIPTION "The name of the keyword for has the keyword_value."
    END_FIELD

    FIELD keyword_value
        TYPE        C68
        DESCRIPTION "The value of the keyword_name. The longest string 
                    allowed by FITS is 68 characters. Most keywords have values
                    that are less than 20 characters. "
    END_FIELD

END_RECORD
 
!------------------------------------------------------------------------------
!
!   RELATION DECLARATION
!
!------------------------------------------------------------------------------
 
 
RELATION  ast_jitter_kw
 
    TYPE             AST_JITTER_KW_TYPE
 
    DESCRIPTION      "AST keywords supplied by JITTER calculations."
 
    SUBSYSTEM_USING  "OPUS"

    INDEX  ast_jitter_kw_1
        TYPE         unique, clustered
        FIELDS       program_id, obset_id, ob_number, keyword_name
    END_INDEX

END_RELATION