At 14:32 20/03/99 , Robert Smathers wrote: >Eduardo Aldridge Vukusic wrote: >> >> I am wondering if it is possible to find elsets for interplanetary >> missions, such as Mars Polar Lander. >> I am a Starry Night (Sienna Software) for Windows user and would greatly >> like to try elsets for non earth orbiting satellites. > >My experience has shown this can be a tricky thing. > >the easy part - there is a web site (JPL connected?) that has >elements and a online form to number crunch some of the more >popular planetary and non-earth-orbit spacecraft. If I can find >the site in my "to add to my trackign web page" queue, I'll add it >in (or I'll wait for someone to come through with the URL and I"ll >add it right away). Gentleman, the URL at JPL is: http://ssd.jpl.nasa.gov/horizons.html though over the last hour that hasnt been responding, which probably means they are doing the daily & weekly backup, or some such maintenance task. It gives elements and/or ephemerides for some spacecraft. They are heliocentric elements , like those use for asteroids in planetarium programs like Starry night, which I am sure Eduardo knows Robert. Lets finish this topic at this point, as its really off-topic in this mailing list. Tony Beresford