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As part of the PanCET program, we have conducted a spectroscopic study ofWASP-79b, an inflated hot Jupiter orbiting an F-type star in Eridanus with aperiod of 3.66 days. Building on the original WASP and TRAPPIST photometry ofSmalley et al (2012), we examine HST/WFC3 (1.125 - 1.650 $\mu$m),Magellan/LDSS-3C (0.6 - 1 $\mu$m) data, and Spitzer data (3.6 and 4.5 $\mu$m).Using data from all three instruments, we constrain the water abundance to be--2.20 $\leq$ log(H$_2$O) $\leq$ --1.55. We present these results along withthe results of an atmospheric retrieval analysis, which favor inclusion of FeHand H$^-$ in the atmospheric model. We also provide an updated ephemeris basedon the Smalley, HST/WFC3, LDSS-3C, Spitzer, and TESS transit times. With thedetectable water feature and its occupation of the clear/cloudy transitionregion of the temperature/gravity phase space, WASP-79b is a target of interestfor the approved JWST Director's Discretionary Early Release Science (DD ERS)program, with ERS observations planned to be the first to execute in Cycle 1.Transiting exoplanets have been approved for 78.1 hours of data collection, andwith the delay in the JWST launch, WASP-79b is now a target for thePanchromatic Transmission program. This program will observe WASP-79b for 42hours in 4 different instrument modes, providing substantially more data bywhich to investigate this hot Jupiter.

Transmission Spectroscopy of WASP-79b from 0.6 to 5.0 $\mu$m