<p><a href="https://i.sstatic.net/muxx6.gif" rel="nofollow noreferrer"><img src="https://i.sstatic.net/muxx6.gif" alt="Example" /></a></p>
<p>how to i can calculate the velocity of the object? If i know the distance of the object from the center of mass, and i know distance between the two (identical) ellipse center... (the two object has the same mass) and of course we know the ellipses semi-major and -minor axis</p>

CC BY-SA 4.0
2023-03-18T22:37:39.217Z
You will need some more information, eg a point in the orbit.  But the generalized problem is converting Kelperian elements to position and velocity.  Search for that, and you should find some good explanations.
Greg Miller
CC BY-SA 4.0
2023-03-19T00:14:16.103Z
One of the most useful equations in orbital mechanics is the [vis-viva equation](https://en.wikipedia.org/wiki/Vis-viva_equation) Also, see answer(s) to [Orbital speeds of Components of Binary System](https://astronomy.stackexchange.com/q/49418/7982)
uhoh
CC BY-SA 4.0
2023-03-19T01:09:26.130Z
I want to know the values of orbital parameters that make siuch system stable.
Domahidi Péter
CC BY-SA 4.0
2023-03-19T05:23:37.150Z
The orbit is stable if the sum of potential & kinetic energies is negative. See https://en.wikipedia.org/wiki/Specific_orbital_energy which is linked from the vis-viva article.
PM 2Ring
CC BY-SA 4.0
2023-03-19T06:21:35.417Z
You had a possibly acceptable answer that was deleted because your question is confusing. Do you want the velocity (title) or the speed? If there are additional requirements then put them in the question, not in comments.
ProfRob
CC BY-SA 4.0
2023-03-19T11:15:44.180Z
Well i want to know velocity but sometimes i confuse with speed.
Domahidi Péter
CC BY-SA 4.0
2023-03-20T07:24:58.620Z
Also see https://physics.stackexchange.com/a/533832/123208
PM 2Ring
<star><gravity>
Velocity of the object in Binary system
Domahidi Péter
# Velocity of the object in Binary system

(Asked by: username_0 on 2023-03-18)

[![Example](https://i.sstatic.net/muxx6.gif)](https://i.sstatic.net/muxx6.gif)

how to i can calculate the velocity of the object? If i know the distance of the object from the center of mass, and i know distance between the two (identical) ellipse center... (the two object has the same mass) and of course we know the ellipses semi-major and -minor axis

**Tags:** star, gravity

> **Comments:**
> **username_1**: You will need some more information, eg a point in the orbit.  But the generalized problem is converting Kelperian elements to position and velocity.  Search for that, and you should find some good explanations.  
> **username_2**: One of the most useful equations in orbital mechanics is the [vis-viva equation](https://en.wikipedia.org/wiki/Vis-viva_equation) Also, see answer(s) to [Orbital speeds of Components of Binary System](https://astronomy.stackexchange.com/q/49418/7982)  
> **username_0**: I want to know the values of orbital parameters that make siuch system stable.  
> **username_3**: The orbit is stable if the sum of potential & kinetic energies is negative. See https://en.wikipedia.org/wiki/Specific_orbital_energy which is linked from the vis-viva article.  
> **username_4**: You had a possibly acceptable answer that was deleted because your question is confusing. Do you want the velocity (title) or the speed? If there are additional requirements then put them in the question, not in comments.  
> **username_0**: Well i want to know velocity but sometimes i confuse with speed.  
> **username_3**: Also see https://physics.stackexchange.com/a/533832/123208  

---

## 0 answers

