  Photometric observations of exoplanet transits can be used to derive the
orbital and physical parameters of an exoplanet. We analyzed several transit
light curves of exoplanets that are suitable for ground-based observations
whose complete information is available on the Exoplanet Transit Database
(ETD). We analyzed transit data of planets including HAT-P-8 b, HAT-P-16 b,
HAT-P-21 b, HAT-P-22 b, HAT-P-28 b and HAT-P-30 b using the AstroImageJ (AIJ)
software package. In this paper, we investigated 82 transit light curves from
ETD, deriving their physical parameters as well as computing their mid-transit
times for future Transit Timing Variation (TTV) analyses. The Precise values of
the parameters show that using AIJ as a fitting tool for follow-up observations
can lead to results comparable to the values at the NASA Exoplanet Archive (the
NEA). Such information will be invaluable considering the numbers of future
discoveries from the ground and space-based exoplanet surveys.
