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Denismartelhebert 3 22 Jul, 2023 @ 5:14pm
Barycenter as center of the binary System
Hello everyone,

I m trying to set a binary star orbit with a barycenter.
It work well if the orbit isn't eccentric....the barycenter is the center of the system and doesn't orbit the biggest star of the system.

But when you set the second star with an eccentric orbit (example: 0.324), the Barycenter orbit the main star.

I tried to modify the eccentricity before (and after) setting the barycenter, it make the barycenter to orbit the main star. You have to show the trails to see it.

It only work (barycenter as the center of the system and seeing both stars orbiting the barycenter) if the eccentricity is at 0.0.

Has anyone be able to make a binary orbit with a modified eccentricity with the barycenter that stay in the center of the system?
Because i would like to see both stars orbiting the barycenter with an eccentric orbit.

Or is it a problem with Universe Sandbox? I know that in the previous version you could set the barycenter as the center of the universe...so it wouldn't move and you would see the stars orbiting it.

Thx :)
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🐋 Syz°.fish 🐬 14 22 Jul, 2023 @ 5:49pm 
First pause the simulation, create the orbit of the second star, then select both objects, open the object menu and create barycenter + balance momentum. Balancing their momentum should allow the barycenter to remain in place.
#1
Denismartelhebert 3 22 Jul, 2023 @ 7:09pm 
Originally posted by 🐋 Syz°.fish 🐬:
First pause the simulation, create the orbit of the second star, then select both objects, open the object menu and create barycenter + balance momentum. Balancing their momentum should allow the barycenter to remain in place.


Thx! i did a few test and it seem to work. But had a few bug like i was locking the SMA, but the Pericenter distance was locking too when i was playing with the eccentricity.
#2
Denismartelhebert 3 22 Jul, 2023 @ 7:24pm 
But, when i ll add planets and dwarfs planets...will i need to balance momentum everytime? Since any objects will affect the calculation of the trajectory of each stars? Or its negligible?
#3
🐋 Syz°.fish 🐬 14 22 Jul, 2023 @ 7:26pm 
Originally posted by Denismartelhebert:
But, when i ll add planets and dwarfs planets...will i need to balance momentum everytime? Since any objects will affect the calculation of the trajectory of each stars? Or its negligible?
This would be negligible but it's good practice to balance the momentum of the whole system so that it remains in place.

It's a bit more complicated if you want planets that orbit both stars because Ubox currently can't predict the orbital motion of those circumbinary planets.
#4
Denismartelhebert 3 22 Jul, 2023 @ 8:20pm 
Originally posted by 🐋 Syz°.fish 🐬:
Originally posted by Denismartelhebert:
But, when i ll add planets and dwarfs planets...will i need to balance momentum everytime? Since any objects will affect the calculation of the trajectory of each stars? Or its negligible?
This would be negligible but it's good practice to balance the momentum of the whole system so that it remains in place.

It's a bit more complicated if you want planets that orbit both stars because Ubox currently can't predict the orbital motion of those circumbinary planets.

Thx for the reply,

yes i will balance the momentum of every objects everytime i place a new.

The planets will be on S-Type orbit, since both stars orbit each others at 63.6 AU with an eccentricity of 0.324.
#5
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Date Posted: 22 Jul, 2023 @ 5:14pm
Posts: 5
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