New balloon-borne observations of whole-disk brightness ratios for Jupiter, Saturn, and Mars are reported in four millimeter/submillimeter bands of bandwidth △v≈12 cm~-1. Using the effective planetary radii of Hildebrand et al., we find that T_Mars/T_Jupiter =1.158 + - 0.015, 1.189 + - 0.015, 1.470 + -0.019, and 1.515 + - 0.019 and T_Saturn/T_Jupiter = 0.833 + - 0.012, 0.758 + - 0.010, 0.818 + - 0.012, and 0.840 + - 0.012, at v=5.7, 9.5, 16.5, and 22.5 cm~-11, respectively. Using models for the brightness temperature of Mars, we also give the whole-disk brightness temperatures for Jupiter and Saturn for the four frequencies.
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