Re: [nbos] Astro3 Experimental Build
"Mike Oliver"
Tue Nov 24th, 2009
The way the "Worldbuilder" Traveller supplement worked was to place the
subsidiary suns in orbits around the primary (orbit numbers generated
randomly). It then made certain orbits, close to these, unavailable for
planets. Then, each remaining orbit was given the chance of having a
planet using it.

No attempt is made to generate stable orbits or have the planetary
bodies generated behave according to astrophysical laws. The result has
always gone unquestioned in my sessions and I was able to produce a
visual display in the Atari programmes I wrote - no orbital movements
were shown (I'm not that good a programmer) but the display was easy to
understand and visually satisfying.

Each of the suns was eligible to have filled orbits. They didn't bother
with stars orbiting a common central point nor figure-of-eight orbits.
Therefore, anything you can provide which improves on this will be
received with gratitude from yours truly.

Cheers,

Mike
www.warmodelling.co.uk
www.cartography-services.co.uk

-----Original Message-----
From: nbossoftware-bounces-at-nbos.com
[mailto:nbossoftware-bounces-at-nbos.com] On Behalf Of NBOS Support
Sent: 24 November 2009 08:21
To: nbossoftware-at-nbos.com
Subject: Re: [nbos] Astro3 Experimental Build

At 09:18 AM 11/22/2009, T'Star wrote:
>The catch is especially when you get up to 3 or more bodies the orbits

>are so convoluted and erratic they only theorize the math based on what

>they've observed. They don't 'stack' the way planet vs. sun does
because
>the mass differential is very seldom great enough... And even with 2
you
>tend to wind up with interesting figure 8 style orbits for your planets

>rather than planets in stable orbit around 2 primaries... (what I
>remember from /my/ astronomy class. basic though it was.)

Yep, that sums it up. Basically there's no way that I know of to
calculate
stable orbits of stars and their planets in multiple star systems,
particularly when there's 3 or more stars. What I'll probably end up
doing
is assigning the component stars a fixed position in a multiple-system
display. They just wont orbit each other. I dont think that will be a
huge setback as those orbits would normally be hundreds or thousands of
years long anyways. Planets can then be tested against those fixed
planets
to see if neighboring stars knock them out of stable orbits.


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