starbase

fk54z - convert coordinates from FK5 to FK4

SYNOPSYS

        `fk54z` [-i *ifile*] [-o *ofile*] *rcol* *dcol*

DESCRIPTION

Convert a J2000.0 FK5 star position from the starbase data table read from the standard input to B1950.0 FK4 assuming zero proper motion and parallax.

Star positions are converted from the new, IAU 1976, FK5, Fricke system to the old, Bessel-Newcomb, FK4 system.

See slaFk54z

OPTIONS

• -i file Read input from file instead of the standard input.
• -o file Write output to file instead of the standard output.

PARAMETERS

• rcol

  The column name of the ra column defaults to "ra".  The
  column should contain RA coordinate values in hours.
  

• dcol

  The column name of the dec column defaults to "dec".  The
  column should contain Dec coordinate values in degrees.
  

• bepoch The converted position in the B1950 reference frame but at Besselian epoch bepoch. For comparison with catalogues the bepoch argument will frequently be 1950.0 and is the default.

PARAMETERS

• rcol

  The column name of the ra column defaults to "ra".  The column should
  contain RA coordinate values in hours.
  

• dcol

  The column name of the dec column defaults to "dec".  The column
  should contain Dec coordinate values in degrees.
  

• bepoch

  The initial position in the B1950 reference frame but at Besselian
  epoch bepoch.  For comparison with catalogues the bepoch argument will
  frequently be 1950.0 and is the default.
  

SEE ALSO

• fk45z - convert ra, dec columns from fk4 to fk5 assuming zero proper motion.
• fk54z - convert ra, dec columns from fk5 to fk4 assuming zero proper motion.
• fk425 - convert ra, dec columns from fk4 to fk5 with proper motion, paralax and recession velocity.
• fk524 - convert ra, dec columns from fk5 to fk4 with proper motion, paralax and recession velocity.

• precess - Precess the ra and dec columns from one equinox to another.

• starbase.1 starbase data table introduction.
• starbase.3 starbase data table C library.
• starbase.5 starbase data table file format.