Re: [nbos] [AS] Binary Star Systems
Charles Sykora
Mon Dec 11th, 2006
Mike, you can enter your own system right now by making a .stc (star
catalog) file (a text file mostly human-legible) and a .ssc file
(star system catalog file) for the planets. You can not only
precisely control elliptical orbits but can enter precise orbital
descriptions in what is called an xyz file to handle complex, non-
elliptical orbits. There are tutorial files on the Celestia web site
to show you how, but it is pretty complex compared to
Astrosynthesis. Celestia can do extremely high resolution planet
images with cloud-cover, night-side images, specularity maps, etc.

On Dec 11, 2006, at 5:15 AM, Mike Oliver wrote:

> My little e-mail has given rise to one or two responses:
> DALE: Thanks for telling me about Celestia. I had, in fact, downloaded
> it a while back but never installed it. I've given it a run through
> and
> it certainly has potential. I haven't had a chance to read the manual,
> so can you tell me: in order for me to have my own stellar system
> shown,
> do I have to wait for your script or can I do so relatively easily
> already? I won't ask for detailed instructions until I have read (and
> probably misunderstood) the manual :-)
> ROBERT: This is the part of your e-mail to which I was responding
> when I
> talked about complex gravitational calculations: "The thing i don't
> get
> with all this is with no offense to nbos, Astro doesn't exactly as far
> as I can tell simulate in itself the effects of gravity etc on an
> orbit." Also, I didn't forget "that it's not just game users who use
> Nbos's stuff some writers also use it etc". I was directing my
> comments
> particularly to gaming experiences and suggesting it was probably
> Games
> Masters rather than players who wanted close scientific accuracy. I
> share your desires for the nice graphic effects but realise it will
> all
> cost money and that nbos are not Eidos or ActiVision so I (as I think
> you do) accept and understand the limitations.
> RICHARD: However circular Earth's orbit may be, I think a solar system
> with ALL planetary orbits exactly circular would be the exception
> rather
> than the rule (but I accept I could be wrong). Robert indicates
> that AS
> can show elliptical orbits and I have to admit I haven't delved
> into its
> behaviour in this respect. I suspect I may have to adjust my solar
> systems by entering some new parameters. The one I mentioned was a
> randomly generated system with only the parent body initially
> generated
> as an "unassigned" body which I then generated as a stellar system. I
> will do some more homework and see what I can achieve. As for
> "realism",
> I refer you to my remarks above about scientific accuracy and nbos'
> facilities.
> CHRISTOPHER: I have a feeling we should be able to get our own systems
> into Celestia but that it won't be easy (what ever is except parting
> with money?). I'll try to have a play around and report back.
> Cheers,
> Mike
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