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 8 of 8 for “"Planetary defense"”.
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Advanced mission planning and impact risk assessment of near-Earth asteroids in application to planetary defense
… of analytic keyhole theory, B-plane mapping, and planetary encounter geometry, augmented by direct numerical simulation, is shown to be useful in determining the impact risk of an asteroid with the Earth on a given encounter, as well as the potential for future encounters. The accurate estimation …
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Design and modeling of kinetic impact missions for deflecting near-earth asteroids
… comets that are thought to be remnants of early planetary formation. As of June 2025, there are more than 1.4 million known small bodies in the solar system, more than 4,000 of which are classified as comets. These objects routinely cross the Earth's orbit at close distances. Some have even …
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Modeling and Characterization of Structural, Thermophysical, and Dynamical Evolutions of Small Bodies in the Solar System
… surprising findings that raise questions about planetary formation, evolution, and even the origins of life. The field of planetary science seeks to address these questions through interdisciplinary approaches, combining insights from astronomy, geology, chemistry, physics, and engineering to …
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On stress, strength, and failure in asteroids during planetary entry
… in Earth’s atmosphere. These models, crucial to planetary defense efforts, necessitate an understanding of the physics underlying fragmentation — including knowledge of key governing physical properties such as strength. Recovered meteorites provide some of the best evidence for these properties. …
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Asteroid deflection campaign design integrating epistemic uncertainty
Planetary defense, or asteroid collision avoidance, has been gaining interest with recent meteor or fly-by events, including the Chelyabinsk meteor that entered the Earth's atmosphere and exploded over Russia in 2013. Past or planned robotic missions to near-Earth asteroids are expected to provide …
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Astrometric and Photometric Data Fusion in Machine Learning-Based Characterization of Resident Space Objects
… the near-Earth object (NEO) 2020 SO, detected by planetary defense survey telescopes. This object, which turned out to be the Centaur upper stage of the Surveyor 2 mission launched in 1966, was temporarily recaptured by the Earth out of heliocentric orbit. After two close fly-bys of the Earth, it …
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Adaptive Control Combined with Integral Concurrent Learning for Trajectory Tracking Near Asteroids
… for scientific studies and possible future planetary-defense missions. Unlike motion around large celestial bodies, spacecraft dynamics near small, rotating asteroids are dominated by weak, highly irregular gravity fields. While full characterization of an asteroid’s shape enables …
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Size-Dependent Earth Impactor Warning Times And Corresponding Campaign Mission Recommendations
… robust survey technology, the first layer of defense, with continued development of precursor characterization transponder mission technology, the second layer of defense.</p>