Josh R. Williams scribbles: |>Just something we could plug into out satellite tracking programs? Just a |>thought.. I know there are ways of doing this now (heck there may even be |>TLEs) but I just thought that there could be another "fun" thing to |>track.. :) For spacecraft in heliocentric orbits here's a starter I think is relevant :-) http://nssdc.gsfc.nasa.gov/space/helios/heli.html couple of comets and planets also thrown in.... all you need now is your calculator! I also seem to recall state vectors for Pioneer and friends out there somewhere. regards, -- Neil Clifford <n.clifford@physics.oxford.ac.uk> http://www.physics.ox.ac.uk/sat/satintro.html