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Date: 2010-12-09 12:50:41 Celestial mechanics Aten asteroids 99942 Apophis Planetary defense Steven J. Ostro Near-Earth object NEODyS Asteroid Cosmic distance ladder Astronomy Planetary science Space		doi:[removed]j.icarus[removed] Add to Reading List Source URL: echo.jpl.nasa.gov Download Document from Source Website File Size: 1,35 MB Share Document on Facebook

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