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ISO LWS Observations of Mars—Detection of Rotational Modulation in the Far Infrared
de Graauw, Th.; Lellouch, E.; Burgdorf, M. +7 more
A series of far infrared (FIR) spectra of Mars between 43 and 196 µm was taken with the Long Wavelength Spectrometer (LWS) on board the European Space Agency's Infrared Space Observatory (ISO). Analysis of these medium-resolution data reveals a rotational modulation of the disk-averaged FIR brightness temperature. The observed variability of…
Adaptive Optics Observations of Saturn's Ring Plane Crossing in August 1995
Owen, T.; Brahic, A.; Dumas, C. +4 more
Adaptive optics (0.15″ resolution) infrared images of the rings and satellites of Saturn were obtained in August 1995 as the Earth was crossing the ring plane. Twelve clumps were detected in the F ring, including HST S5 and S7 objects. For the first time H magnitudes were obtained for Prometheus, Pandora, Telesto, and Calypso, and J magnitudes for…
Comet Shoemaker-Levy 9 Dust Size and Velocity Distributions
Hahn, Joseph M.; Rettig, Terrence W.
Pre-impact observations of Comet Shoemaker-Levy 9 (S-L9) obtained with the Hubble Space Telescope are examined, and a model of an active, dust-producing comet is fitted to images of fragments G, H, K, and L. The model assumes steady isotropic dust emission from each fragment's sunlit hemisphere. Best-fit results indicate that the dominant light-sc…
HST High-Resolution Backscatter Image of Saturn's G Ring
French, Richard G.; Lissauer, Jack J.
On 14 October 1996, we imaged Saturn's faint G ring with the Hubble Space Telescope's WFPC2 Planetary Camera. This is the highest resolution image of the G ring ever obtained in backscattered light, with an image scale of only 282 km per pixel. The 400-s exposure was taken using the F555W filter at a solar phase angle of α=1.93° and a ring tilt of…