Asteroids are smaller than planets, bigger than meteoroids, and they don't have the tail or fuzzy appearance that a comet does. "Minor planet" is a technical term for asteroid.
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- Views of the Solar System: Asteroid Introduction Background information, details on selected asteroids, image gallery.
- Asteroid Radar Research NASA JPL asteroid research using radar. Introduction, scientific activity, asteroid images.
- Asteroid Observing Services from Lowell Observatory Tools to help observers select targets and plan observations. Also, orbital elements, reference star catalog data and software, link to Lowell Observatory Near Earth Object Search (LONEOS).
- Minor Planet Groups and Families Listing and description of dynamical groups and physical families of asteroids.
- Minor Planet Observer Lightcurve collaboration, physical studies, software, Palmer Divide Observatory.
- Introduction to Asteroids Covers history, asteroid composition, Earth collisions.
- Asteroids Common questions.
- Eric Weisstein's World of Astronomy: Asteroids Dynamical groups of asteroids, mathematical formulas, the Tunguska event.
- News on Hilda Asteroids A review of current knowledge of this dynamical group. Overview, low eccentricity Hildas, the Schubart family, numbered Hildas of the Palomar-Leiden survey.
- Asteroids From the Uppsala Planetary System Group. Overview, research projects, discoveries.
- Dan Durda's Research Interests Airborne observations, Vulcanoids, various asteroid collision effects.
- Small Main-Belt Asteroid Spectroscopic Survey II Data sets and references to scientific literature describing results.
- Asteroid Articles Archive of articles posted at the Planetary Science Research Discoveries site at the University of Hawaii.
- Bill Bottke's Asteroid Research Collisions, tidal disruption, dynamics, planetary impacts, crater chains and doublet craters.
- Asteroids with Satellites Lists of known or suspected asteroids with satellites. Also history, graphs, links.
- Asteroid Groups Graphs and animations showing major asteroid groups and families.
- Physical studies of asteroids at Poznan Observatory Light curves, database of asteroid spin vectors.
- European Asteroid Research Node Association of European research groups active in asteroid research. Links to member sites and resources useful for asteroid research.
- Wikipedia: Asteroid Encyclopedia article covers history, groups of asteroids, spectral types. Tables of largest and notable asteroids.
- Nine Planets: Asteroids Overview of current scientific knowledge of asteroids.
- Asteroids Chart showing relative sizes, distance from the sun, inclination/eccentricity, shape, and color. Other charts showing position in the solar system. Summary data.
- Association of Lunar and Planetary Observers: Minor Planets Section Photometry and shape modeling program, magnitude alert project, finder charts, visual observing of minor planets.
- Asteroids: Their History Information on the study of these objects orbiting the sun.
- Asteroid Fact Sheet Provides a table of information on selected asteroids.
- Windows to the Universe: Asteroids Description, data on selected asteroids, images.
- Minor Planets Offers updated alphabetical list of minor planet names.
- Solar System Exploration: Asteroids Basic description, overview of asteroid science.