fk54 - Convert the ra and dec columns of an starbase data table from FK5 to FK4.
SYNOPSYS
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.
Star positions are converted from the new, IAU 1976,
FK5, Fricke system to the old, Bessel-Newcomb, FK4 system.
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.