### Saturn

The 2024 brightness temperature spectra gives lower values than the Legacy model. The difference is on the order of 5% from 70 to 210 GHz but increases to 10% at from 210 to 230 GHz and above 300 GHz. A Saturn's atmospheric line makes the offset bigger in the 230-300 GHz range (30% offset around 270GHz).

In CASA the choice was made not to use Saturn as a flux calibrator (because the rings make the modelling of an average brightness temperature difficult)

Like Jupiter, Saturn is in general not used as a flux calibrator, so the impact of the new model should remain limited.

Figure 6: Comparison of the brightness temperature of Mars at 80 GHz as a found by the ASTRO Legacy (black line) and the CASA models (red line). Top panel shows the expected temperature behavior over a decade, while middle and bottom panels show zoom on a period of one year and one month, respectively.

Figure 7: Same as Fig. FigMarsT80 but for 150 GHz.

Figure 8: Same as Fig. FigMarsT80 but for 230 GHz.

Figure 9: Same as Fig. FigMarsT80 but for 360 GHz.