The Outer Planet Atmospheres Legacy (OPAL) program—is a Hubble Space Telescope (HST) imaging program that maps the four giant planets every year. The program cements the long-term legacy of HST by ensuring a regular cadence of giant planet observations to fill temporal gaps between individual programs. The main goal of OPAL is to study long-term trends tied to seasonal or other evolutionary cycles (including storm activity, wind field variability, and changes in aerosols) in the highly dynamic atmospheres of the giant planets.
