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The general theory of relativity predicts the relativistic effect in theorbital motions of S-stars which are orbiting around our Milky-way galacticcenter. The post-Newtonian or higher-order approximated Schwarzschild blackhole models have been used by GRAVITY and UCLA galactic center groups tocarefully investigate the S2 star's periastron precession. In this paper, weinvestigate the scalar field effect on the orbital dynamics of S2 star. Hence,we consider a spacetime, namely Janis-Newman-Winicour (JNW) spacetime which isseeded by a minimally coupled, mass-less scalar field. The novel feature ofthis spacetime is that one can retain the Schwarzschild spacetime from JNWspacetime considering zero scalar charge. We constrain the scalar charge of JNWspacetime by best fitting the astrometric data of S2 star using theMonte-Carlo-Markov-Chain (MCMC) technique assuming the charge to be positive.Our best-fitted result implies that similar to the Schwarzschild black holespacetime, the JNW naked singularity spacetime with an appropriate scalarcharge also offers a satisfactory fitting to the observed data for S2 star.Therefore, the JNW naked singularity could be a contender for explaining thenature of Sgr A* through the orbital motions of the S2 star.

Relativistic orbits of S2 star in the presence of scalar field