Converting State Vector

[Guest kepler]

Hi,

 

I have sort of a problem: I have a routine to calculate the geometric place

of the bodies in our solar system. But the question is that the results are

referred to the J2000 epoch frame. I was trying to convert the vector [

x,y,z,vx,vy,vz ] from the J2000 epoch to one TDB choosen epoch, correcting

the values for precession and nutation, getting [ x',y',z',vx',vy',vz' ];

and then, convert this result vector to the ecliptic plane, obtaining a new

vector [ x",y",z",vx",vy",vz" ]. Does anyone knows the routines to make this

calculation?

 

Please answer as soon as possible - this is very urgent.

 

Kind regards,

 

Kepler