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Hubble space telescope observations of the 1990 equatorial disturbance on Saturn: Zonal winds and central Meridian albedos

Beebe, R. F.; Westphal, J. A.; Barnet, C. D. +1 more

Two sets of Hubble Space Telescope (HST) data, obtained in August 1990 and November 1990, are compared with Voyager 1 and 2 data acquired in 1980 and 1981. A rare disturbance developed in the equatorial region of Saturn in late September 1990. Due to the large equatorial wind shear, this disturbance generated inhomogeneous bright cloud structures …

Titan: Evidence for seasonal change—A comparison of Hubble space telescope and voyager images

Weaver, H. A.; Tomasko, M. G.; Caldwell, John +7 more

Images of Titan were obtained by the Hubble Space Telescope (HST) on 26 August 1990. Comparison with Voyager 1 and Voyager 2 images obtained 10 and 9 years earlier shows that the seasonal hemispheric brightness asymmetry has reversed near 440 and 550 nm wavelengths, with the northern hemisphere now being brighter. An additional, noisy HST image at…

The onset and growth of the 1990 equatorial disturbance on Saturn

Beebe, R. F.; Barnet, C.; Murrell, A. S. +1 more

The development of cloud structures at low Saturnian latitudes in September 1990 can be divided into three phases: the onset and expansion of the initial disturbance (popularly known as the Great White Spot), the eastward and westward expansion of the bright cloud, and the eventual formation of wave-like structures encircling the equator. The thre…

Hubble space telescope observations of the 1990 equatorial disturbance on Saturn: Images, albedos, and limb darkening

Ingersoll, Andrew P.; Baum, William A.; Westphal, James A. +4 more

In September 1990 a major equatorial eruption on Saturn produced a disturbance that spread in longitude until it completely girdled the planet. We report here on 150 images recorded in six passbands with the Wide Field/Planetary Camera (WF/PC) aboard the Hubble Space Telescope (HST) on 17 and 18 November 1990. For comparison, we used HST-WF/PC obs…

Inner coma imaging of Comet Levy (1990c) with the Hubble space telescope

Feldman, P. D.; A'Hearn, M. F.; Weaver, H. A. +5 more

Comet Levy (1990c) was observed with the Hubble Space Telescope (HST) on UT 27 September 1990 when both the heliocentric and geocentric distances were ∼1 AU. Two sets of images of the comet were taken 6.5 hr apart with the Wide-Field Camera (WFC) through a broadband red filter that was selected to isolate continuum emission peaking sharply at the …