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WHAT DO WE REALLY KNOW ABOUT URANUS AND NEPTUNE? [PDF]
Astrophysical Journal Letters, 2012 The internal structures and compositions of Uranus and Neptune are not well constrained due to the uncertainty in rotation period and flattening, as well as the relatively large error bars on the gravitational coefficients.
Boué +9 more
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A collisionless scenario for Uranus tilting [PDF]
The Astrophysical Journal, 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
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Thermodynamics of diamond formation from hydrocarbon mixtures in planets [PDF]
Nature Communications, 2023 This study combines computational chemistry and machine learning to provide insight on whether diamonds can form inside ice giants. This can help explain the dichotomy of Uranus and Neptune.
Bingqing Cheng +2 more
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Uranus and Neptune: Shape and Rotation [PDF]
, 2010 Both Uranus and Neptune are thought to have strong zonal winds with velocities of several hundred meters per second. These wind velocities, however, assume solid-body rotation periods based on Voyager 2 measurements of periodic variations in the planets'
Anderson +29 more
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Long-term observations of Uranus and Neptune at 90 GHz with the IRAM 30m telescope - (1985 -- 2005) [PDF]
, 2008 The planets Uranus and Neptune with small apparent diameters are primary calibration standards. We investigate their variability at ~90 GHz using archived data taken at the IRAM 30m telescope during the 20 years period 1985 to 2005.
A. Greve +19 more
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Noble Gas Planetology and the Xenon Clouds of Uranus [PDF]
The Planetary Science JournalNoble gases provide tracers of cosmic provenance that are accessible to a future Uranus atmospheric probe. Argon and krypton are expected to be well mixed on Uranus with respect to H _2 and He, although condensation at the winter pole may be possible ...
Kevin Zahnle
doaj +2 more sources
Uranus’s Influence on Neptune’s Exterior Mean-motion Resonances [PDF]
The Planetary Science JournalNeptune’s external mean-motion resonances play an important role in sculpting the observed population of trans-Neptunian objects (TNOs). The population of scattering TNOs is known to “stick” to Neptune's resonances while evolving in semimajor axis ( a ),
Severance Graham, Kathryn Volk
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Monthly Notices of the Royal Astronomical SocietyThese images of Uranus and its rings and moons were captured by the Hubble Space Telescope and by the Voyager 2 spacecraft. The images are accompanied by a brief description and history, some statistical facts, and important dates in the exploration of ...
core +4 more sources
Setting the Stage for Uranian Seismology from Rings and Radial Velocities [PDF]
The Planetary Science JournalA Uranus orbiter would be well positioned to detect the planet’s free oscillation modes, whose frequencies can resolve questions about Uranus’s weakly constrained interior.
Christopher R. Mankovich +8 more
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International Astronomical Union Colloquium, 1982 From the start of this century until the mid-1970’s the rotation rate of Uranus was reported to be 10.8 h in a retrograde sense (see, for example, Allen, 1955), but a cursory examination of the origin of this datum reveals that little confidence should be placed in it.Three independent techniques for measuring the rotation rate are available, each very
R. M. Goody
openalex +3 more sources