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Unformatted text preview: es to coalesce and prevented a larger planet from forming. Asteroids: Other Groups Asteroids: Other Groups Trojans 889 asteroids leading and trailing Jupiter by 60° Centaurs 67 asteroids found between Jupiter & Neptune Kuiper Belt Objects More than 400 large asteroids beyond Neptune Near­Earth Asteroids (NEAs) 103 Atens: orbits interior to Earth's 593 Apollos: orbits that cross Earth's 595 Amors: orbits exterior to Earth's (e.g. 433 Eros) All these populations remain incompletely inventoried. Asteroids: NEAs Asteroids: NEAs Thousands of NEAs have been discovered through recent surveys. Asteroids: Composition Asteroids: Composition Spectroscopy and radar observations of asteroids reveal four main classes: C Type: dark, "carbon rich", albedo ~5% D Type: dark, very red spectra S Type: brighter, “stony", albedo ~20% M Type: rare "metallic" type, very radar bright C,D,S Types are possibly all primitive. M Types and other anomalous classes might be from differentiated parent bodies. Much debated. Asteroids: Spectral Distribution Composition varies systematically with distance from the Sun. Suggests that asteroids might preserve the cond...
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