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.
Results
Showing 1 to 16 of 16 for “"outer Solar System"”.
-
Stellar occultations by bodies in the outer solar system at the South African Astronomical Observatory
… on the origin and evolutionary processes of the Solar System is harbored by primitive bodies called trans-Neptunian objects (TNOs). Their preserved state is due to these bodies having orbits at and beyond that of Neptune, as this specific area is considered to be the least thermally modified in …
-
Mission and System Design for In-Situ Resource Utilization in the Outer Solar System using Nuclear Propulsion Technologies
… of a theoretical in-situ propellant acquisition system is examined for a sample return mission from trans-Neptunian destinations (>40au) using two theoretical spacecraft designs, which compare nuclear propulsion systems for impulsive and continuous thrust. Each available propellant substance is …
-
The use of stellar occultations to study the figures and atmospheres of small bodies in the outer solar system
… stellar occultations by small bodies in the outer solar system are discussed with examples from Triton, Pluto, and Charon. Simulations were performed characterizing the analysis of multi-chord occultations including: the effects of the direction of residual minimization in figure fits, the …
-
Photometric and spectral analysis of the distribution of crystalline and amorphous ices on Enceladus as seen by Cassini
… activity based on amorphization rates in the outer solar system.
-
GENETICS, AGES, AND CHEMICAL COMPOSITIONS OF IRON METEORITES
… for isotopic heterogeneity in the early Solar System are not discerned by the siderophile element chemical characteristics of planetesimals. Iron meteorite parent bodies from the CC reservoir typically have smaller relative cores and a greater proportion of the Fe content in the mantle, …
-
SPECTROSCOPIC STUDY OF ICES WITH ASTROPHYSICAL INTEREST
… of ices present in interstellar space and in outer solar system bodies. Furthermore, I studied the self-diffusion of CO2 isotopes in different thin-film arrangements. Mid-IR laboratory data of the morphological change of CH4, CH4-volatile mixture, and CO2 during thermal processing will become …
-
Exploring the Concept of a Deep Space Solar-Powered Small Spacecraft
… the modest payload requirements to study the outer Solar System (OSS) with the capabilities of low-power nano-satellites may enable much more affordable access to deep space. This paper explores a design concept for a low-cost, small spacecraft, designed to study the OSS and satisfy mission …
-
Establishing A Crewed Presence On Titan
… station orbiting Titan holds many benefits, the outer solar system could be reached without relying on once-in-a-lifetime alignments, methane from the atmosphere could be easily stored for propellant, and emergency logistics for future missions could be available. In order for humanity to reach …
-
THE CONCENTRATION OF HYDROGEN IN INCOMPLETELY AND WHOLLY MELTED TERRESTRIAL BUILDING BLOCKS
Hydrogen (H) is the most abundant element in our solar system and exerts a primary control on the habitability, and geochemical and geodynamic evolution of rocky bodies. Therefore, constraining the source(s), timing of accretion, and abundance of H in the Earth and other bodies is of fundamental …
-
Automated planetary satellite tour planning with a novel low-thrust direct transcription method
… the use of low-thrust electric propulsion systems on board the spacecraft to enable future tours. The optimal trajectory for a given mission profile using low-thrust may be highly non-intuitive. There are thus many challenging aspects to the design of multiple flyby, low-thrust …
-
Astrometria, efemérides e ocultações estelares de satélites irregulares e corpos do sistema solar exterior
The study of outer Solar System bodies like trans-Neptunian objects (TNOs), Centaurs and Irregular Satellites (relatively unaltered remnants from the early Solar System) helps us to understand the formation and evolution of the Solar System. Only a few spacecrafts were sent to explore these regions …
-
Deformation and its surface expression in stressed planetary materials
… 3 applies these findings to the evolution of icy systems through simulated deformation of ice-melt aggregates, suggesting that current seismic studies which do not correct for the orientation of melt may misinterpret deformation at the base of warm ice sheets. The final two chapters center on …
-
The origin and evolution of Transneptunian binaries
… a detailed analysis of the properties of all systems formed during cloud collapse. These results are compared to the latest observed transneptunian binaries. We find that gravitational instability is an extremely efficient producer of bound planetesimal systems; it is common for a single cloud …
-
A methodology for state determination without prior information using X-ray pulsar navigation systems
… may result in position ambiguity within the Solar System and typically requires an initial position estimate in order to determine spacecraft position. This dissertation presents a method to determine spacecraft position using XNAV in the absence of any prior state information, a scenario …
-
Collimation of deuterium / 3-helium fusion products for advanced spacecraft propulsion and power
… they have their limitations. Exploration of the outer solar system, Jupiter and beyond will most likely require a new generation of propulsion system. One potential technology class to provide spacecraft propulsion and power systems involve thermonuclear fusion plasma systems. In this class it is …
-
Deciphering the thermal evolution of small planetary bodies.
… meteorites were the first bodies to form in our solar system and the building blocks of the terrestrial planets, as well as the cores of the gas giants. They also played an important role in the delivery of volatiles to the inner solar system planets, including the Earth. These bodies also hosted …