CATALOG FORMAT

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CATALOG FORMAT

            In the ASTRO source catalog format each source uses one line of  the
        catalog  file.   Each line should contain the following consecutive key-
        words (some may be omitted):
         1) Source name field:
            The source name field is a composite item which can accomodate several
            names for a single source. Names should be separated by a vertical bar
            ( | ) with no embedded spaces, e.g.: B0415+379|3C111. Each name must
            have at most 12 characters.
         2) Coordinate system: 2 characters, optional, may be:
              EQ for equatorial coordinates. If "EQ" is given explicitely,
                                     then the Equinox value is mandatory.
              GA for Galactic II coordinates.
              EC for J2000 Ecliptic coordinates
              HO for horizontal coordinates
              DA for equatorial, present-day coordinates.
         3) Equinox: needed for equatorial coordinates after "EQ" keyword.
         4) Longitude-like coordinate: in degrees, except for EQ and DA where it
            should be in hours. Format is
                  hh:mm:ss.sss[,first[,second]]
            where
                  "hh:mm:ss.sss" is a generalized sexagesimal format
                    (hh:mm:ss.sss or dd.ddd or hh:mm.mmm)
                  "first" is an (optional) first order time derivative
                  "second" is an (optional) second order time derivative
         5) Latitude-like coordinate: in degrees, same format as above.

         The following OPTIONAL keywords can also be included, they have to be liste
         any order:

        A) an "hour" keyword to indicate the validation hour for the
           coordinates (which is useful when time derivatives are given),
           specified by HOUR Value

        B) A "Parallax" keyword
           PARALLAX Value Value is in arcsec.

        C) a "Velocity" or "Redshift"  keyword
           Velocity|redshift Value
           where "Velocity" is an alphabetic code, equal to "LSR", "HELIO",
           or "EARTH". HELIO actually means: referred to the Solar System
           barycenter. Value is the velocity in km/second, in the
           corresponding reference frame. Default is zero. If no keyword is
           present a default frame will be chosen according to the coordinate
           frame

        C') the "REDSHIFT" keyword
            Redshift Value
            Value is the redshift value.
            The user may provide a redshift OR a velocity, not both.

        D) an "Intensity" keyword
           FLUX  Value [Index]
           Value is the flux in Jy. Index is an optional spectral index
           Mx  Value
           Value is the magnitude, Unknown values can be coded 99.99
           Mx can be MAGNITUDE, or x is one of V,R,I,J,H,K,L,M,N to indicate
           the visual band

        E) Additional magnitudes keywords
           Mx  Value
           Additional magnitude can be given in the V,R,I,J,H,K,L,M,N bands