# chuckstables

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1. ## [WIP][1.8.1, 1.9.1, 1.10.1, 1.11.0] Principia—version Germain, released 2021-01-13—n-Body and Extended Body Gravitation

Simple answer; No. You can't do that. Here's why. An Nth order truncated geopotential has terms which go like 1/R^(N+1) in it, where R is the radius from the center of the planet. Therefore, for your kerbin, which has a radius about 3.125 times less than earth's, terms of order N in the geopotential will be 3.125^(N+1) times larger on your kerbin's surface than they'd be on earth's surface. For a 30th order geopotential this is about 7*10^14 times larger for the highest order terms. What you can do is make your own reasonable geopotential for your kerbin. For sun-synchronous orbits
2. ## [WIP][1.8.1, 1.9.1, 1.10.1, 1.11.0] Principia—version Germain, released 2021-01-13—n-Body and Extended Body Gravitation

I did the frozen orbit quite a while ago so no; I don't have any pictures. That being said it wasn't perfect; it ended up being unstable over a 12 month period with no correction burns. In GMAT the orbit was stable for around 3 years from what I remember with no correction burns, but the fact that it worked with a periapsis of around 30-40 km from what I remember is remarkable. I did it before the orbit analysis window actually was introduced as well; I just went forward in time. Here's the paper I based it off of; https://lunar.gsfc.nasa.gov/library/LRO_AAS_Paper_07-057.pdf In particula
3. ## [WIP][1.8.1, 1.9.1, 1.10.1, 1.11.0] Principia—version Germain, released 2021-01-13—n-Body and Extended Body Gravitation

Yeah definitely fair. I was more just curious whether it would be possible; I've always assumed that the cost of the N-body calculation for the solar system would be more than for a vessel, but that does make sense. I'm curious; what's your time step for asteroids and "unknown" objects? Is it the 10 second one or the 10 minute one? As an aside; I'm honestly super impressed that this mod actually exists; it's absolutely incredible. What's even more awesome is that it's free. I've gotten hours of fun times playing around trying to get quasi-frozen low lunar orbits. I was impressed to see t
4. ## [WIP][1.8.1, 1.9.1, 1.10.1, 1.11.0] Principia—version Germain, released 2021-01-13—n-Body and Extended Body Gravitation

It's not really that simple. You need high fidelity symplectic integrators to get stable orbits if you are going to go the numerical route. Otherwise energy is not conserved and orbits will diverge and become horribly unstable. It's far simpler using patched conics because the orbits are known EXACTLY with mathematical functions. Once you're in a sphere of influence you use math to determine the exact shape (a conic section) of your orbit and boom; you're done. Your spacecraft is now on rails; there is no need to determine the gravitational force acting on you. There is no real numerical integ
5. ## [WIP][1.8.1, 1.9.1, 1.10.1, 1.11.0] Principia—version Germain, released 2021-01-13—n-Body and Extended Body Gravitation

Would you guys consider adding in an Ephemeris model for Real Solar System? That way we wouldn't have to simulate the full N-body dynamics of all the planets and they could just follow high fidelity trajectories that exist in a data file. There's lots of high precision Ephemeris models available for the solar system IRL for trajectory designs for missions. This could speed things up quite a bit. Just curious. Thanks!
6. ## [1.7.3-1.8.1] Realism Overhaul v12.8.1 [17 April 2020]

Hey. I found a few errors in the configs for SSTU. These are pretty simple to fix; I'm using the latest download of Realism overhaul from github. In RealismOverhaul/RO_SuggestedMods/SSTU/SSTU_SCC_Orion.cfg there's a source for a bug that makes it so that the capsule is stuck with the default resources it's given by SSTU. If you try to change these in game it will revert back to the default resources when you launch or reload the craft file. To fix this you have to add !MODULE[SSTUVolumeContainer]{} before you add the ModuleFuelTanks module and define the resources you want the part to ha
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