Figure 20:

Synthetic images of Neptune (Top row) relevant to the next opposition on 7 September 2018, simulating what the JWST MIRI instrument would be able to see if it were operating at that time: (Left) in the tropospheric continuum at 18.6 μm, (Second from left) in the methane emission band at 7.7 μm, (Second from right) in ethane emission at 12.2 μm, and (Right) in acetylene emission at 13.6 μm. The dashed line marks the central meridian, and the black dot is at the position of the south pole. Brightness-temperature cross sections in the same four wavelength regions were also extracted (Middle row) along the central meridian to highlight latitude variations and (Bottom row) along a latitude circle at the sub-Earth latitude to highlight variations in brightness temperature with emission angle.