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Measurement of Cohesion in Asteroid Regolith MaterialsThere is increasing evidence that a large fraction of asteroids, and even Phobos, have such low densities (<2 g/cu cm) that the are unlikely to be consolidated rocks in space.-Water is unlikely due to close orbits to the sun. Instead, many of these asteroids are thought to be made up of unconsolidated smaller particles of varying size referred to as rubble piles. Images of the asteroid Itokawa reinforce this hypothesis. What holds the rubble piles together? Gravitational forces alone are not strong enough to hold together rubble pile asteroids, at least not those that are rapidly spinning Van der Waals forces and or Electrostatic forces must therefore be responsible for holding them together. Previous work suggests that electrostatic forces, which are orders of magnitude stronger are far more likely. Charge build-up is a likely consequence of the interaction of airless bodies with the solar wind plasma, analogous to what has been proposed to occur on the moon. Objective: Experimentally measure cohesive forces relevant to those holding rubble pile asteroids together
Document ID
20170004390
Document Type
Presentation
Authors
Kleinhenz, Julie (NASA Glenn Research Center Cleveland, OH United States)
Gaier, James (NASA Glenn Research Center Cleveland, OH United States)
Waters, Deborah (NASA Glenn Research Center Cleveland, OH United States)
Harvey, Ralph (Case Western Reserve Univ. Cleveland, OH, United States)
Zeszut, Zoe (Case Western Reserve Univ. Cleveland, OH, United States)
Carreno, Brandon (Case Western Reserve Univ. Cleveland, OH, United States)
Shober, Patrick (Case Western Reserve Univ. Cleveland, OH, United States)
Date Acquired
May 5, 2017
Publication Date
January 9, 2017
Subject Category
Lunar and Planetary Science and Exploration
Report/Patent Number
GRC-E-DAA-TN38386
Meeting Information
SciTech Forum and Exposition(Grapevine, Texas)
Funding Number(s)
WBS: WBS 811073.0214.02.93
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
meteorites
regolith
asteroids
in-situ resource Utilization

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