Thermal phase curves in the 6.7, 11, and 15 μm bands obtained for one orbit, for three eccentricities, and two observation geometries. In the circular case, lightcurves are centered on the superior conjunction (dayside in view) and are time-averaged while the gray area is the 1σ variability due to meteorology. For a given eccentricity, the same orbit is used for both observation geometries. The periastron (p) and apoastron (a) are indicated by vertical lines.