Calculated spectral energy distribution and measured flux densities from the 289P composite image in Visit A (MJD 58786: UT 2019 October 30, inbound). The flux densities at W1 (3.4 μm) and W2 (4.6 μm) are shown as points. The uncertainties are within the point size. The reflected sunlight model (blue line), thermal model (red line), and combined signal (black line) are overplotted. The geometric parameters R_h = 1.20 au, Δ = 0.40 au, and α = ﹩49\mathop{.}\limits^{\circ }8﹩, are used for the models.