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We discuss optical colors of 10,592 asteroids with known orbits selected froma sample of 58,000 moving objects observed by the Sloan Digital Sky Survey(SDSS). This is more than ten times larger sample that includes both orbitalparameters and multi-band photometric measurements than previously available.We confirm that asteroid dynamical families, defined as clusters in orbitalparameter space, also strongly segregate in color space. In particular, wedemonstrate that the three major asteroid families (Eos, Koronis, and Themis),together with the Vesta family, represent four main asteroid color types. Theirdistinctive optical colors indicate that the variations in chemical compositionwithin a family are much smaller than the compositional differences betweenfamilies, and strongly support earlier suggestions that asteroids belonging toa particular family have a common origin. We estimate that over 90% ofasteroids belong to families.Comment: 18 pages, color figures, accepted by A

Color Confirmation of Asteroid Families