# Center of Mass

1. Jun 4, 2009

### Stratosphere

What is the correct formula for center of mass of a binary system? I had seen that it is

$$R=\frac{m_{1}r_{1}+m_{2}r_{2}}{m_{1}+m_{2}}$$
If that is the right equations what exactly does r one and two stand for? I had also seen a much more complicated formula.

Side note: This is not homework

2. Jun 4, 2009