General information and data, pictures, details on the most interesting ones.

Encyclopedia entry covers physical characteristics, history. List of well-known comets.

Basic features, data, discoveries, images and sections with specific information on selected comets.

Updated news letter on observation opportunities, designation of names and discoveries. Includes observation data and links.

Article by William Newcott republished from the National Geographic magazine.

Movies of comets from the Solar and Heliospheric Observatory. Also, background, archives, and how to interpret images and report new discoveries.

The original discovery and latest news about a new class of interplanetary bodies.

Orbit computations for selected comets.

Offers updated orbital data, lists and orbit diagrams. Includes near Earth objects and minor planets.

Informative illustrated explanation of what comets are, what they are made of, where they come from and how to observe them.

Glossary of comet (and astronomical) terms.

History, orbits, composition, ways comets are studied, relation to meteor showers. Comets Halley, Shoemaker-Levy 9. From the National Air and Space Museum.

Overview provided by David Jewitt, an astronomer at UCLA.

The solar polar orbit satellite observed tail of comet Hyakutake by means of magnetic fields and particle count anomalies. Article from Science News.

Extensive coverage of the event July 1994. Includes observations, reports, 1444 images, news releases and links.

News, observations, analyses of current comets, images, archives, links.

Catalogue of images, ordered by comet.

From the Smithsonian Astrophysical Observatory. News, observations, orbital data, comet names and designations, links.

Downloadable catalog. Also news, reading list, articles, links.

Comet data archive for amateur astronomers. Includes observation logs and discussions. In English and Italian.

A list of comets discovered by Canadian astronomers.

News, recent observations, observing information and advice.