Paper:	The Orbital Ephemeris of HD 209458b
Volume:	321, Extrasolar Planets: Today and Tomorrow
Page:	215
Authors:	Wittenmyer, R.A.; Welsh, W.F.; Orosz, J.A.; Schultz, A.B.; Kinzel, W.; Kochte, M.; Bruhweiler, F.; Bennum, D.; Henry, G.
Abstract:	We derive a substantially improved ephemeris for HD209458b based on photometric transit observations. I-band observations taken at SDSU's Mount Laguna Observatory during the 2001, 2002, and 2003 observing seasons were combined with transit observations by the Hubble Space Telescope STIS (Brown et al. 2001) and FGS (Schultz et al. 2003), and additional ground-based APT photometry. The Eclipsing Light Curve code (ELC) for binary star modelling was used to fit the observations. We derive an orbital period of P = 3.52474541 ± 0.00000025 days and mid transit time of T0 = 2452854.825415 ± 0.000060 HJD. The uncertainty in period is only 0.021 seconds, over 15 times more precise than previous results.

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