Brightness Temperatures of Saturn's Disk and Rings at 400 and 700 Micrometers

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Science  14 Nov 1980:
Vol. 210, Issue 4471, pp. 788-789
DOI: 10.1126/science.210.4471.788


Saturn was observed in two broad submillimeter photometric bands with the rings nearly edge-on. The observed brightness temperatures fall below the predictions of atmospheric models constructed from data at shorter wavelenths, indicating the presence of an opacity source besides pressure-broadened hydrogen lines in the submillimeter region. In combination with earlier measurements at larger inclination angles, these results yield a 400-micrometer brightness temperature for the rings of75 K.