Search Publications
Seasonal and radial trends in Saturn’s thermal plasma between the main rings and Enceladus
Johnson, R. E.; Elrod, M. K.; Tseng, W. -L. +1 more
A goal of Cassini's extended mission is to examine the seasonal variations of Saturn's magnetosphere, moons, and rings. Recently we showed that the thermal plasma between the main rings and Enceladus exhibited a time dependence that we attributed to a seasonally variable source of oxygen from the main rings (Elrod, M.K., Tseng, W.-L., Wilson, R.J.…
Cassini ISS observation of Saturn’s String of Pearls
Dyudina, Ulyana A.; Ingersoll, Andrew P.; Ewald, Shawn P. +2 more
We present the dynamics of the String of Pearls (SoPs) feature observed by the Cassini spacecraft’s Imaging Science Subsystem (ISS) camera between 2007 and 2010. The SoPs was originally discovered in the 5 µm images captured by Cassini VIMS instrument, where it appeared as a chain of infrared-bright spots (Momary, T.W., et al. [2006]. The Zo…
The transit spectra of Earth and Jupiter
Aigrain, S.; Fletcher, L. N.; Lee, J. -M. +3 more
In recent years, an increasing number of observations have been made of the transits of 'Hot Jupiters', such as HD 189733b, about their parent stars from the visible through to mid-infrared wavelengths, which have been modelled to derive the likely atmospheric structure and composition of these planets. As measurement techniques improve, the measu…
The global vortex analysis of Jupiter and Saturn based on Cassini Imaging Science Subsystem
Li, Liming; Jiang, Xun; Trammell, Harold Justin +3 more
Presented in this manuscript are observations exploring vortices with diameters larger than 1000 km on Jupiter and Saturn. These images are taken from the Imaging Science Subsystem onboard the Cassini Spacecraft. The analyses of Saturn's vortices show that there are significantly more vortices in the Southern Hemisphere (SH) than in the Northern H…
Volcanism on farside of the Moon: New evidence from Antoniadi in South Pole Aitken basin
Senthil Kumar, P.; Sruthi, U.
The lunar surface is characterized by asymmetric distribution of its volcanic deposits. The nearside contains about 90% of the mare basalts, while there are a few on the farside with some are in the South Pole Aitken (SPA) basin, which is the largest and oldest impact basin on the Moon. Although the mare volcanism on the nearside of the Moon has b…
Minerals detection for hyperspectral images using adapted linear unmixing: LinMin
Schmidt, Frédéric; Legendre, Maxime; Le Mouëlic, Stéphane
Minerals detection over large volume of spectra is the challenge addressed by current hyperspectral imaging spectrometer in Planetary Science. Instruments such OMEGA (Mars Express), CRISM (Mars Reconnaissance Orbiter), M3 (Chandrayaan-1), VIRTIS (Rosetta) and many more, have been producing very large datasets since one decade. We propos…
Multiple asteroid systems (45) Eugenia and (87) Sylvia: Sensitivity to external and internal perturbations
Marchis, F.; Beauvalet, L.
Satellites of asteroids are a widely used way to determine the masses and other dynamical parameters of their systems. We make such a determination here, using data from the two triple-asteroid systems, (45) Eugenia and (87) Sylvia, that come from the Hubble Space Telescope and adaptive optics on three 8-10 m class telescopes (Keck, VLT, Gemini No…
CH4 mixing ratios at microbar pressure levels of Jupiter as constrained by 3-micron ISO data
Moses, J. I.; Sim, C. K.; Kim, Sang J. +1 more
Infrared Space Observatory (ISO) data of Jupiter are revisited in order to derive CH4 mixing ratios at microbar pressures in the atmosphere. We utilize the most updated radiative transfer programs to construct a 3-µm emission model of CH4 to be compared with the ISO data. From the model-data comparisons, we derive the h…
Saturn’s F Ring core: Calm in the midst of chaos
Scargle, J. D.; Showalter, M. R.; Colwell, J. E. +5 more
The long-term stability of the narrow F Ring core has been hard to understand. Instead of acting as “shepherds”, Prometheus and Pandora together stir the vast preponderance of the region into a chaotic state, consistent with the orbits of newly discovered objects like S/2004 S 6. We show how a comb of very narrow radial locations of high stability…
First far-ultraviolet disk-integrated phase curve analysis of Mimas, Tethys and Dione from the Cassini-UVIS data sets
Hendrix, Amanda R.; Royer, Emilie M.
We perform an analysis of the photometric properties of the icy saturnian satellites at 180 nm, based on the first far-UV disk-integrated phase curves of Mimas, Tethys and Dione. Their interactions with the environment (the E-ring and the magnetosphere) are investigated, leading to a better understanding of the effects of exogenic processes on the…