FK4 to FK5
CALL sla_FK425 (R1950,D1950,DR1950,DD1950,P1950,V1950,
R2000,D2000,DR2000,DD2000,P2000,V2000)
R1950  D  B1950.0 $\alpha $ (radians) 
 
D1950  D  B1950.0 $\delta $ (radians) 
 
DR1950  D  B1950.0 proper motion in $\alpha $ (radians per tropical year) 


DD1950  D  B1950.0 proper motion in $\delta $ (radians per tropical year) 


P1950  D  B1950.0 parallax (arcsec) 


V1950  D  B1950.0 radial velocity (km s${}^{1}$, +ve = moving away) 
R2000  D  J2000.0 $\alpha $ (radians) 
 
D2000  D  J2000.0 $\delta $ (radians) 
 
DR2000  D  J2000.0 proper motion in $\alpha $ (radians per Julian year) 


DD2000  D  J2000.0 proper motion in $\delta $ (radians per Julian year) 


P2000  D  J2000.0 parallax (arcsec) 


V2000  D  J2000.0 radial velocity (km s${}^{1}$, +ve = moving away) 