HD 209458 Planetary Transit

Photometric observations of HD 209458 from the night of 1999 Nov. 7 UT taken with the T8 0.80m APT at Fairborn Observatory showing ingress of the planetary transit. The measured transit depth is 0.017 mag or 1.58%. The error bar shows the predicted time of mid transit and its uncertainty computed from the Keck radial velocities.