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Orbiter English => Orbiter English => Topic started by: apollo on 24 July 2008, 02:18:29

Title: orbits
Post by: apollo on 24 July 2008, 02:18:29

How do I change the orbits of planets and moons. I'm trying to make the moon get real close to Earth. What a view it would be. 8o

Title: Re: orbits
Post by: ar81 on 25 July 2008, 17:06:00

Edit Moon.cfg

Title: Re: orbits
Post by: apollo on 26 July 2008, 00:42:16

which number

Title: Re: orbits
Post by: Urwumpe on 26 July 2008, 10:35:44

First, make a copy of Sol.cfg.  Name the copy "Sol_lowmoon.cfg"

Second, make a copy of Moon.cfg and name it "Moon_low.cfg"

Remove the "Module=Moon" part from the copy to replace the ephemeris module with a standard Kepler element propagation.
Include the Kepler elements of the desired orbit instead: Epoch, SemiMajorAxis, Eccentricity, Inclination, LongAscNode,
LongPerihelion and MeanLongitude.


Keep the "Name=moon" line, as this is important for the textures.

In "sol_lowmoon.cfg", replace the "Earth:Moon1=Moon" line by "Earth:Moon1=Moon_low".

Done. Now you just need to select "Sol_lowmoon" instead of "Sol" as solar system in your scenarios, to have the moon lower as
usual.

Title: Re: orbits
Post by: StarLost on 27 July 2008, 02:22:30

Heyo, Urwumpe ... long time, no talk.

Of course, you realize that his next questions will probably be how to obtain the correct Keplerian elements for such a
hypothetical position.  Best to refer him to the various orbit manipulation programs such as those available at Jaqar.

Edit:  Oh hell, let's make it a bit easier.  Go to SimCosmos site, under development tools and look for OCalc 2 (it is at Avsim).  It will give you the orbital elements you need, just plug in the required altitude.



Post Edited ( 07-27-08 02:38 )

Title: Re: orbits
Post by: Urwumpe on 27 July 2008, 08:03:11

Quote

StarLost a écrit:

Of course, you realize that his next questions will probably be how to obtain the correct Keplerian elements for such a
hypothetical position.  Best to refer him to the various orbit manipulation programs such as those available at Jaqar.

Edit:  Oh hell, let's make it a bit easier.  Go to SimCosmos site, under development tools and look for OCalc 2 (it is at
Avsim).  It will give you the orbital elements you need, just plug in the required altitude.

I assume, he can read the manual finally and maybe decide to play more with orbiter to learn about these elements by seeing
them inside Orbit MFD. ;)