Feasibility of detecting an Enceladus-like opposition effect signal in an exoplanet phase curve using both JWST and the future Habitable Worlds Observatory. The first panel shows the results when we use phase curves with an eclipse present and the second panel shows results without an eclipse present. The red line shows the FWHM value of the injected signal and the blue and orange points show the retrieved value, with 1σ errorbars. We find that, as expected, this signal is easier to detect in phase curves without an eclipse present, however this is still way beyond feasibility for both JWST and Habitable Worlds.