This is something I've been working on in my spare time, to randomly generate star systems according to Cosmos 2http://alternityrpg.net/solar_system_generator
It should be fairly accurate. It does not generate planet mass yet or the stuff after it in the PDF, I might add that later.
Sometimes the planets "inside prime" orbit have non-standard orbits, but I had to do this to avoid a bug.
I don't think I have orbits totally correct, they seem odd.
The PRINTABLE version of the page is on white, do a Print Preview to see it.
Screenshot for you Internet Explorer uses who can't use SVG.