We report a rotational light curve and Fourier baseline model for the Jupiter Trojan (15094) Polymele, a primary target of the NASA Lucy mission, obtained on 2026 May 19─20 and May 21─22 UT with the Two-meter Twin Telescope (TTT). Phase-Dispersion Minimization over the combined two-night dataset yields Prot = 5.762 ± 0.051 hr and a peak-to-peak amplitude of 0.076 ± 0.008 mag. Our period is slightly shorter than, but consistent within 2σ with, the previously reported value and excludes the ∼11.5 hr alias sometimes cited in mission documentation. We provide the full Fourier model to support the ongoing ground-based campaign to detect mutual events between Polymele and its satellite ahead of the 2027 flyby.