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#!/bin/sh
#
#1 fk54 - Convert the ra and dec columns of an starbase data table from FK5 to FK4. # fk54 < file 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.

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Star positions are converted from the new, IAU 1976,

FK5, Fricke system to the old, Bessel-Newcomb, FK4 system.

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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. #

SEE ALSO

*<@fk54.src@> Source text of #fk54.

*<#@slalink.1#> programs available with the slalink extensions to #tawk.

*<#@slalink.4#> functions available with the slalink extensions to #tawk.

*<#@precess#> Precess the ra and dec columns from one equinox to another.

*<#@fk45#> Convert the ra and dec columns of an starbase data table from FK4 to FK5.

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