Four transits of the exoplanet HAT-P-23b were recently observed with the 0.36 m telescope at the Universidad de Monterrey Observatory .
The four light curves were successfully combined to obtain a resulting one with reduced scattering per bin .
This one was modeled using a Monte Carlo method to obtain the essential parameters that characterize the system .
Assuming orbital parameters such as eccentricity e and longitude of periastron \omega from the discovery paper , we found values of Rp / R _ { \star } = 0.1105 ^ { +0.0015 } _ { -0.0013 } for the planet-to-star radius ratio , a / R _ { \star } = 4.23 ^ { +0.06 } _ { -0.12 } for the scaled semimajor axis , and an orbital inclination of the system of i = 87.9 \arcdeg ^ { +1.5 } _ { -2.2 } .
We also derive an improved orbital period of 1.2128868 \pm 0.0000004 days ( T _ { \mathrm { o } } = 2 , 454 , 852.26542 \pm 0.00018 BJD_TDB ) for the system .