Calculating Center of Mass in Binary Systems

[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

 

[0xDEADBEEF]

If you write it like this without vector arrows above, than this means the capital R and r1 and r2 are the numbers that you would read on an imaginary ruler (for the center of mass, and the first and second mass respectively), that lies on the line connecting the two masses.
Otherwise these are the location vectors of the center of mass and the masses.

 

[Stratosphere]

If you write it like this without vector arrows above, than this means the capital R and r1 and r2 are the numbers that you would read on an imaginary ruler (for the center of mass, and the first and second mass respectively), that lies on the line connecting the two masses.
Otherwise these are the location vectors of the center of mass and the masses.

Thanks.