Wikimedia
Wikipedia: Asteroid
This site from the encyclopedia Wikipedia is a good resource page on asteroids. Gives details on different groups of asteroids that have been identified; how they get their name and number after identification; the six types of...
Nine Planets
The Nine Planets: Asteroids 253 Mathilde
This site explores what is currently known about the asteroid 253 Mathilde. Content includes an orbiting path, and composition. Links are provided throughout for additional information.