Ref Sys Velocity Reference for sytem velocity. Ref Proper Motion Reference for Proper Motion. Proper Motion RA Proper Motion for RA, in J2000 values. Proper Motion Dec Proper Motion for Declination, in J2000 values. X Coords Rectangular space coordinates relative to the sun in parsecs.
X is in the direction toward the galactic center.
Y Coords Rectangular space coordinates relative to the sun in parsecs. Y is in the direction of the galactic rotation. Z Coords Rectangular space coordinates relative to the sun in parsecs. Z is the distance from the galactic plane and is positive toward the galactic north pole. V is in the direction of the galactic rotation.