I built a system with 2 black holes, ten stars, 4 brown dwarfs and 20 gas giants that support 232 habitable worlds. I'm now adding a couple thousand lifeless planets and stars.

They all have specific orbits and follow them quite well.

Send me a spread sheet or something that details the specifics of every body in the system and I should be able to throw something together without much effort.

My Yahoo username is tkulogo, and you can send the email there.

Thank you ! I sent an email with the information.

Okay, what you have specified here has some serious problems if you want it to simulate, so I'm going to need to know what direction you want to go.

1st, you have 2 additional "stars" that have no listed mass. What is their minimum mass? Do brown dwarfs work? Thjazi 2 and Alpha have names and descriptions swapped so I'm not sure which in the inner one. This inner star will disrupt some of the inner planets' orbits.

Bêta, Gamma, Delta, Epsilon, and Zêta are also large enough to disrupt each other and nearby orbits because they're very close. Can binary planets and moons be used in this area instead of all discrete planets?

Thjazi 3 will disrupt the orbits of Nu and Xi, and unless it's very small, Lambda and Mu.

As a rule of thumb, stars can't be placed around other stars in planet like orbits because stars are thousands or millions of times more massive than planets, but the most massive star that is old enough to have solid planets is less than 100 times more massive than the least massive true star.

If you want, I'll put these objects in an example system that's more typical of multi-star systems.

I didn't specify the mass of the two other stars because I am flexible, provided their masses make my idea of the system work. But I had in mind Thjazi 2 being a small one, a dwarf yes. And Thjazi 3 being closer to the Sun mass. But it can be way lighter if it helps.

Alpha was supposed to be before Thjazi 2. But it can be further, it doesn't really matter. I still have this liberty to move it beyond Thjazi 2.
Omega I succeeded to make it stable really close to Thjazi 1, I'm not too worried.

Bêta, Gamma, Epsilon can become small rocky planets if it helps. Delta can be smaller too.
Zêta should stay a giant gas planet bigger than Jupiter as I already used it in my story.
Binary planets can be used indeed, I hadn't thought of that. For example between Beta and gamma. Or between Zêta and Epsilon or both. It could be interesting actually.
Also, if it's really impossible I have an idea. As I'm writing SF and the system is populated by a very advanced species, one of the planet could be kind of planet-like ship. I mean, it could be like a giant sphere ship, an artificial megastructure and therefore with a negligible mass. (so putting it in Universe Sandbox like a ridiculous mass or even without putting it, I could handle if it stayed in my imagination).

Lambda can be very small indeed. Xi I laready described it with this radius, it should stay the same but it can be further from Thjazi 3 or around it.
Nu and Mu can be whatever size works.

And for Thjazi 3 that far, if it can't work, I must figure out something else.
Thanks

Well, I was hoping it send you something today, but for some reason the 7th planet from the end keeps picking UI_STRING...CameraDummy as its orbital parent. I'll have to figure it out next week.

I'm not sure you're going to like it, but it's a starting point we can work from.

Ok thanks. No hurry. I left yesterday the place where I have my gaming PC (my laptop is not powerful enough for US2 simulations).
And I won't return there until end of Octobre. So I won't be able to run/see any simulation until then. So take your time. Thanks a lot.

I sent you some files. Did you get them?

Yes I got them. Thanks. Did you get my emails in response ? I sent a second email today.

For some reason the one you sent on Oct 10th went into spam, but the rest have not. The one you just today wasn't marked as spam. I'll read them both now.

Originally posted by Biglower:

Hi,
I'v read a lot of guides, watched few videos and proceed to many tries but I'm stuck to create my planetary system with orbits that are stable.

My goal :
Creating a 19 planets system. One main star at the center, binary with a smaller one, the 11th planet should be around 2UA, then I'm more flexible for the outer remaining planets. The third star is very far.

The issue :
I managed to create a stable binary core with one planet. But then, when I put the others, the orbital period of these planets vary a bit. I mean, it's quite stable but the time of orbit around the stars keeps changing between a maximum and minimum.

My wish :
Having a stable system regarding the orbits of 19 planets and 3 stars in order to start work on the planets characteristics and the moons.

If someone can help me and give soùe tips. I'm even willing to pay for someone to create such a system that I can then use and detail.
Note that I respected some limits I've reads on some guides : at least 0,15 UA between planets etc.
Thanks !

good luck lmao, 3 body problem is troubling

I got it done.

You just reminded me, I was going to add a specific moon to the system for him and I didn't.

Hey, general question, are there some best practice tipps for beginners to create a stable star system? Are there options that should be disabled? E.g. disbale temperature / gravity for some bodies (if that is possible at all) :D

Here's a couple random ones:

A parent should be ~100 times more massive than it's satellite if you're not going for a binary system.

A moon's orbital period should be no more than about a tenth the orbital period of the planet.