Re: [nbos] [AS] I know what I want an orbit to look like...NBOS Support Tue Feb 3rd, 2009 For calculating the correct eccentricity to use... good question. Try the formulas here: http://en.wikipedia.org/wiki/Orbital_eccentricity You'll need to fill in the periapsis and apoapsis (ie, .1 and 3). I came up with approx 0.935 You'll probably have to play with the numbers, but keep in mind the orbital period is defined by the orbital distance - you wont be able to get both a 3 AU apoapsis *and* and a specific orbital period. Ed At 09:32 PM 1/31/2009, you wrote: >...so how do I get there? :) > >Example: If I want a planet's perihelion to be 0.01 AU every 200 days and >aphelion 3 AU, how can I play with the planet data to get this? I've only >ever used AS2 for galactic maps, never touched the planetary bits until now. > >For what it's worth, I'm looking at modeling a system for sci-fi fiction >purposes. Neutron star with stellar companion in a decently wide orbit, >planet weaving in and out of them often enough that every X centuries the >exotic life which lives there goes into hibernation to survive. > >So yeah, eccentric orbits FTW. Help! :D > >Thanks all! >_______________________________________________ >Nbossoftware mailing list > > _______________________________________________ Nbossoftware mailing list