Record Details

Measurement of Cohesion in Asteroid Regolith Materials
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Author and Affiliation:
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)
Abstract: There 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
Publication Date: Jan 09, 2017
Document ID:
20170004390
(Acquired May 18, 2017)
Subject Category: LUNAR AND PLANETARY SCIENCE AND EXPLORATION
Report/Patent Number: GRC-E-DAA-TN38386
Document Type: Oral/Visual Presentation
Publication Information: (SEE 20170001425)
Meeting Information: SciTech Forum and Exposition; 9-13 Jan. 2017; Grapevine, Texas; United States
Meeting Sponsor: American Inst. of Aeronautics and Astronautics; Reston, VA, United States
Contract/Grant/Task Num: WBS 811073.0214.02.93
Financial Sponsor: NASA Glenn Research Center; Cleveland, OH United States
Organization Source: NASA Glenn Research Center; Cleveland, OH United States
Description: 18p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: ASTEROIDS; COHESION; REGOLITH; PLASMA INTERACTIONS; GRAVITATIONAL FIELDS; VAN DER WAALS FORCES; PHOBOS; ELECTROSTATICS; ROCKS; SOLAR WIND; SUN; MOON
Other Descriptors: ASTEROIDS; METEORITES; REGOLITH; IN-SITU RESOURCE UTILIZATION
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