Disk-Integrated Lunar Brightness Temperatures between 89 and 190 GHz

Figure 1

Pointing direction of the deep space view (green) compared to the celestial equator (red) and the ecliptic (blue). The slight tilt of the Moon’s orbit against the ecliptic and of the orbital axis of the weather satellite against the equator is not shown for the sake of simplicity. The DSV points some 75° away from nadir—angle α in (3)—and describes a circle in the sky during an orbit of the satellite. When the Moon touches this circle, it appears in the DSV [3].