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For reference on Jacobi Coordinate used for solving 2-Body problem, I referred Wikipedia Jacobi Coordinate, and on looking at those equation I can't get the meaning of the symbol q in the equation for Vector to center of mass,

Rjk = ( mjqj + mkqk )( mj + mk )

It would be helpful if some one could help.Snippet from Wikipedia

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It should be an r in the notation that they used before. These are the position vectors of the two objects. And a hint: If you are confused next time, try finding different sources. I'm sure the definition of the center of mass vector can be found elsewhere.

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  • $\begingroup$ OK, now that make sense $\endgroup$ – STAIN Mar 16 at 9:41

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