Close Encounters of Asteroids and Comets to Planets

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This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). The authors find by numerical simulations that the elongated-potato shape that is characteristic of Earth-crossing asteroids (ECAs) is likely the result of previous close tidal encounters with Earth. Some meteoroids graze the atmosphere of Earth before returning to space (at reduced speed). They used a spherical atmospheric model to study such grazers to find the condition under which they are captured into gravitationally bound orbits around Earth. They find that for about every thousand iron asteroids that hit the ... continued below

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Hills, J.G.; Goda, M.P. & Solem, J.C. July 9, 1999.

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Description

This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). The authors find by numerical simulations that the elongated-potato shape that is characteristic of Earth-crossing asteroids (ECAs) is likely the result of previous close tidal encounters with Earth. Some meteoroids graze the atmosphere of Earth before returning to space (at reduced speed). They used a spherical atmospheric model to study such grazers to find the condition under which they are captured into gravitationally bound orbits around Earth. They find that for about every thousand iron asteroids that hit the Earth, one is captured into a gravitational-bound orbit. Some fraction of these captured objects will have their orbits stabilized for many revolutions by tidal encounters with the Moon and the sun. They have also studied how the damage produced by such grazing and near-grazing asteroids differs from that produced by asteroids that hit Earth more directly.

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Medium: P; Size: vp.

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OSTI as DE00759193

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  • Other Information: PBD: 9 Jul 1999

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  • Report No.: LA-UR-99-3157
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/759193 | External Link
  • Office of Scientific & Technical Information Report Number: 759193
  • Archival Resource Key: ark:/67531/metadc710474

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  • July 9, 1999

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • March 24, 2016, 6:10 p.m.

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Hills, J.G.; Goda, M.P. & Solem, J.C. Close Encounters of Asteroids and Comets to Planets, report, July 9, 1999; New Mexico. (digital.library.unt.edu/ark:/67531/metadc710474/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.