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In the circular case of the coplanar Restricted Three-body Problem, we studied how the family of quasi-satellite (QS) periodic orbits allows to define an associated libration center. Using the averaged problem, we highlighted a validity limit of this one: for QS orbits with low eccentricities, the averaged problem does not correspond to the real problem. We do the same procedure to L3, L4 and L5 emerging periodic orbits families and remarked that for very high eccentricities 
${\cal F}_{L_4}$ and 
${\cal F}_{L_5}$ merge with 
${\cal F}_{L_3}$ which bifurcates to a stable family.
