Results 31 to 40 of about 1,113 (144)
A collisionless scenario for Uranus tilting
, 2010 The origin of the high inclination of Uranus' spin-axis (Uranus' obliquity) is one of the great unanswered questions about the Solar system. Giant planets are believed to form with nearly zero obliquity, and it has been shown that the present behaviour ...
Boué, Laskar, Murray-Clay, Ward
core +3 more sources
Evidence for Ammonia-bearing Species on the Uranian Satellite Ariel Supports Recent Geologic Activity [PDF]
The Astrophysical Journal Letters, 2020 Abstract We investigated whether ammonia-rich constituents are present on the surface of the Uranian moon Ariel by analyzing 32 near-infrared reflectance spectra collected over a wide range of sub-observer longitudes and latitudes. We measured the band areas and depths of a 2.2 μm feature in these spectra, which has been attributed to ...
Richard J. Cartwright +8 more
openaire +2 more sources
Optical Spectroscopy of the Uranian Moons from Equinox to Northern Summer
The Planetary Science JournalWe present an analysis of ground-based visible and near-infrared wavelength (VIS, ∼0.4–0.9 μ m) reflectance spectra of the four largest Uranian satellites, utilizing observations with multiple telescopes, collected near Uranian equinox and in northern ...
Riley A. DeColibus +5 more
doaj +1 more source
Resonantly-forced Eccentric Ringlets: Relationships between Surface Density, Resonance location, Eccentricity and Eccentricity-gradient [PDF]
, 2004 We use a simple model of the dynamics of a narrow-eccentric ring, to put some constraints on some of the observable properties of the real systems.In this work we concentrate on the case of the `Titan ringlet of Saturn'.Our approach is fluid-like, since ...
Melita, M. D., Papaloizou, J. C. B.
core +2 more sources
JWST Spectrophotometry of the Small Satellites of Uranus and Neptune
The Planetary Science JournalWe use 1.4–4.6 μ m multiband photometry of the small inner Uranian and Neptunian satellites obtained with the James Webb Space Telescope’s near-infrared imager NIRCam to characterize their surface compositions.
Matthew Belyakov +4 more
doaj +1 more source
Seasonal Variability In The Ionosphere Of Uranus [PDF]
, 2011 Infrared ground-based observations using IRTF, UKIRT, and Keck II of Uranus have been analyzed as to identify the long-term behavior of the H-3(+) ionosphere.
Encrenaz, T. +5 more
core +2 more sources
Predictions of the mutual events of the Uranian satellites occurring in 2006–2009 [PDF]
Astronomy & Astrophysics, 2006 Context. Every 42 years, the Earth and the Sun pass through the equatorial plane of Uranus allowing observations of mutual occultations and eclipses of the main satellites of Uranus. The next opportunity will occur in 2006-2009. Aims. Such events are uncommon and very rare, and they allow us to accurately determine the inclinations of the orbits of the
Arlot, Jean-Eudes +2 more
openaire +2 more sources
Elastic thickness and heat flux estimates for the uranian satellite Ariel [PDF]
Icarus, 2015 The surface of Ariel, an icy satellite orbiting Uranus, shows extensional tectonic features suggesting an episode of endogenic heating in the satellite's past. Using topography derived from stereo-photoclinometry, we identified flexural uplift at a rift zone suggesting elastic thickness values in the range 3.8-4.4 km. We estimate the temperature at the
Peterson, G., Nimmo, F., Schenk, P.
openaire +3 more sources
Nonlinear Resonances in the Solar System
, 1994 Orbital resonances are ubiquitous in the Solar system. They play a decisive role in the long term dynamics, and in some cases the physical evolution, of the planets and of their natural satellites, as well as the evolution of small bodies (including dust)
Allan +50 more
core +1 more source
New Moons of Uranus and Neptune from Ultradeep Pencil-beam Surveys
The Astronomical JournalWe have conducted extremely ultradeep pencil-beam observations for new satellites around both Uranus and Neptune. Tens of images on several different nights in 2021, 2022, and 2023 were obtained, shifted, and added together to reach as faint as 26.9 and ...
Scott S. Sheppard +6 more
doaj +1 more source