  We derive an explicit analytical expression for the magnetic dipole moment of
the rho meson, mu_rho, in a relativistic constituent-quark model. We adopt our
relativistic approach to composite systems, modified instant-form (mIF)
Relativistic Quantum Mechanics (RQM), that we used particularly to construct a
unified pi&rho model (Phys. Rev. D93, 036007 (2016) = arXiv:1602.00907)
describing electroweak properties of light mesons. This model provides a
parameter-free calculation to give mu_rho=(2.16+-0.03) [e/2M_rho] which is in
accordance with the conventional experimental data. The magnetic, quadrupole
and charge form factors also are derived and presented. We consider the small
uncertainty of our value of magnetic moment as one of undoubted advantages of
the method. A comparison is made with recent lattice QCD results and previous
calculations using a variety of methods.
