Reports

The Rotation Period of Saturn's Polar Hexagon

Science  09 Mar 1990:
Vol. 247, Issue 4947, pp. 1206-1208
DOI: 10.1126/science.247.4947.1206

Abstract

The rotation rates of the interiors of the outer planets are normally derived from their periodic radio emissions. However, recent observations of both Jupiter and Saturn have revealed surface features with periods close to those derived for the interiors. In the study reported here, this process is carried one stage further, with the derivation of a rotation rate for the spot associated with Satum's polar hexagon, which is simultaneously within and more accurate than the Saturnian radio period.