Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"Uranus"”.
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Uranus orbiter and probe mission : Project Upsilon
… Upsilon is a proposed NASA Flagship Class, Uranus Orbiter and Probe mission concept to investigate Uranus' planetary magnetic field and atmosphere. Three spacecraft - the Upsilon-0 Propulsion Module, the Upsilon-1 Science Orbiter, and the Upsilon-2 Atmosphere Probe - shall be implemented to …
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The ortho-para hydrogen equilibrium in the Uranus atmosphere
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1979.
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Gravity-assist trajectories to Venus, Mars, and the ice giants: Mission design with human and robotic applications
<p>Gravity-assist trajectories to Uranus and Neptune are found (with the allowance of impulsive maneuvers using chemical propulsion) for launch dates ranging from 2024 to 2038 for Uranus and 2020 to 2070 for Neptune. Solutions are found using a patched conic model with analytical ephemeris via the …
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First Visible Wavelength Lightcurves for the Northern Hemispheres of Titania and Oberon
… inherently difficult given their proximity to Uranus. Contamination from stray Uranian light is a major challenge and the background near the satellites must be well characterized. I mitigated the effects of stray Uranian light using point spread function photometry. I modelled Uranus with a …
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Reducing the Compositional and Structural Degeneracy of Planetary Interiors
… I eliminate unmixed interior scenarios for Uranus, rule out the fossil-compressed formation hypothesis for high-density exoplanets, and establish a link between formation history and atmospheric composition for hypothetical Earth-like white dwarf (WD) exoplanets, reducing interior degeneracy …
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A Photometric Investigation of the Major Uranian Satellites
… decadal survey ranked a flagship NASA mission to Uranus, with a required launch window of the early 2030s, as a top priority. Further study is urgently needed, both scientifically and to inform mission planning. We conducted a photometric study, primarily using MIT’s Wallace Astrophysical …
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Interplanetary mission design with applications to guidance and optimal control of aero-assisted trajectories
… are found for aerocapture maneuvers at Uranus and Neptune. With a large radius, and short rotational periods, atmospheric rotation must be taken into account to accurately model the system dynamics.</p> <p>Investigation of the 2018 Inspiration Mars free-return opportunity is conducted. A …
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To Build Home and to Live in (U)Hygge
… “turning” enables. Finally, “Act III: A Home on Uranus” constructs a hybrid orientation between assimilation and marginalization to imagine a refuge built with jouissance, the delight in pain and danger.
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Laboratory Measurements of the Millimeter Wavelength Opacity of Phosphine (PH3) and Ammonia (NH3) Under Simulated Conditions for the Cassini-Saturn Encounter
… of the giant planets (Jupiter, Saturn, Uranus and Neptune) are fundamental to understanding the processes which formed these planets and the solar system as a whole. Microwave observations of these planets probe regions in their atmospheres from approximately 0.1 to several bars, a …
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Alternative Mission Concepts for the Exploration of Outer Planets Using Small Satellite Swarms
… be easily translated to other targets such as Uranus, Neptune or the asteroid belt.</p>
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An Aerocapture Guidance and Estimation Framework for Improved Robustness to Uncertainty
… algorithm. Extensive simulation results of a Uranus aerocapture scenario, including over 140,000 Monte Carlo trajectories, demonstrate significant improvements in capture success rates and propellant efficiency compared to existing methods. The second contribution addresses environmental …
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Spacecraft Orbit Design in the Circular Restricted Three-Body Problem Using Higher-Dimensional Poincaré Maps
… trajectories in the Earth-Moon, Sun-Earth, and Uranus-Titania systems. Included in the approach is a method for representing, interpreting, and manipulating four-dimensional Poincaré maps in an interactive, three-dimensional visual environment in which the fourth dimension is displayed using …
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The far-infrared absorption spectrum of low temperature hydrogen gas
… to those found in the atmospheres of the planets Uranus and Neptune, these spectra also have relevance to astronomical observations of 112. This work demonstrates, in particular, the feasibility of using measurements of the HD R(0) line and the underlying 112 translational band to obtain planetary …
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Acoustic-Gravity Wave Propagation Based on Solutions to the Generalized Multi-component Transport Equations
… and carbon monoxide. In contrast, on Titan, Uranus, and Neptune, species diffusion plays a comparatively minor role, with bulk and shear viscosity effects dominating wave attenuation in these atmospheres.</p>
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Automated trajectory planning for multiple-flyby interplanetary missions
… missions to Jupiter, Mercury, and Uranus.