In this paper, we present the thermal properties of the medium formed in ultra-relativistic heavy-ion collisions at chemical freeze-out using a thermal model. Experimental data of various hadron species from 0-5% most central Au+Au collisions at sNN=19.6GeV from the STAR BES program are used to analyze the thermal properties, namely chemical freeze-out temperature, baryon chemical potential and strangeness chemical potential. A chi 2 minimization technique is employed to obtain thermal properties. We also obtain thermal properties with strangeness conversation condition and at zero potentials mu B/T=mu S/T=0. We compared particle ratios from the thermal model with the experimental data. The thermal model describes particle ratios within +/- 2 standard deviations and chi 2/NDF between 1-2. We discuss collision energy dependence of thermodynamic properties of the medium at freeze-out and compare results with the published STAR results and other thermal model calculations.