Online Resources
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Online Astronomical Images & Data

 
Nine Planets Solar System Tour is an overview of the history, mythology, and current scientific knowledge of each of the planets and moons in our solar system. Each page has text and images, some have sounds and movies, most provide references to additional related information.
Messier Deep-Sky Catalog a complete guide to the 110 objects recognized as the standard Messier catalog. For each object, an image is presented together with a short description.
Best of the Space Telescope A sort of HST "greatest hits" album.  Hosted by SEDS, this site is much faster than the StSci site.
The Web Nebulae Bill Arnett's gallery of images and information about nebulae.
NGC 2000 Browser Hartmut Frommert's site that allows you to enter an NGC catalogue number.  It then returns a page that conatains images, data and descriptions of each object.
Digitized Sky Survey is an online browser of the NGS-POSS-I sky survey images-- perfect for verifying comets and minor planets.
NASA's SkyView is a Virtual Observatory on the Net generating images of any part of the sky at wavelengths in all regimes from Radio to Gamma-Ray.
Automated POSS-I Plate Scanner Use this site to search the POSS-I catalog, create a finder chart or generate an image from the Palimar Observatory Sky Survey.
BASS 2000 is a high resolution solar spectrum browser provided by the Institut National des Sciences de l'Univers / Observatoire de Paris.
Solar System Simulator Created by David Seal, this amazing site generates  simulated view of the solar system, planets, satellites, etc. based on your input.  look.gif (1071 bytes)

Online Star Charts

AstroImage is a Finnish site that quickly generates an all-sky chart as a GIF image. You control the date, time and observing location.
Mike Harvey's Galactic Sky Charts A form interface allows you to create GIF images of the sky generated by Carina Software's Voyager II software
Hawaiian Astronomical Society's Storybook and Deepsky Atlas is a collection of images generated by Software Bisque's The Sky.   It includes constellations, as well as the Messier and Caldwell catalogues.
Mount Wilson Observatory's StarMap Service uses a forms-based interface that creates a postscript (.ps) file that can then be printed on any postscript printer.
StarGazer Java atlas A simple java applet that allows you to manipulate an all-sky view.
Starchart Map Server is a collection of programs for making postscript (.ps) maps of the sky from an electronic database of more than 250,000 celestial objects.

 

Online Data & Catalogs

Astronomical Data Center (ADC) A NASA resource for astronomical catalogs and journal data tables.
Astrophysical Data System (ADS) provides several data access services through the World Wide Web.
Canada Astronomical Data Center (CADC) The CADC was established in 1986 as one of three world-wide distribution centres for data from the Hubble Space Telescope.
JPL's Solar System Dynamics Group JPL's solar system dynamics WWW site provides information related to all known bodies in orbit around the sun.
NASA/IPAC Extragalactic Database (NED) is built around a master list of extragalactic objects for which cross-identifications of names have been established, accurate positions and redshifts entered to the extent possible, and some basic data collected. Bibliographic references relevant to individual objects have been compiled, and abstracts of extragalactic interest are kept on line. Detailed and referenced photometry, position, and redshift data have been taken from large compilations, and will eventually be collected from the literature.
National Space Science Data Center (NSSDC) provides access to a wide variety of astrophysics, space physics, solar physics, lunar and planetary data from NASA space flight missions, in addition to selected other data and some models and software.
NGC/IC Project is a collaborative effort between professional and amateur astronomers working together to correctly identify all of the original NGC and IC objects, starting with the original discoverer's notes and working forward in time to encompass the work of contemporary astronomers, both professional and amateur, such that the identity of each of the NGC and IC objects is known with as much certainty as we can reasonably bring to it from the existing historical record.
Other Worlds, Distant Suns Catalog of extrasolar planets.
Planetary Data System (PDS) The Planetary Data System (PDS) archives and distributes digital data from past and present NASA planetary missions, astronomical observations, and laboratory measurements.
SIMBAD Galactic Object Database, created and maintained by the CDS, Strasbourg, brings together basic data, cross-identifications, observational measurements, and bibliography, for celestial objects outside the solar system: stars, galaxies, and nonstellar objects within our galaxy, or in external galaxies.
Strasbourg Astronomical Data Center is a data center dedicated to the collection and worldwide distribution of astronomical data and related information.
Universal Research Archive of Networked Information in Astronomy (URANIA) Named for the muse of astronomy, the Urania resource is composed of electronic astronomical scholarly journals, bibliographic information, electronic archives of original data, electronic copies of the historical scholarly literature for the last twenty years and a special reference system archive organized by object in the sky. The separate resources which make up Urania comprise a functioning distributed digital library of astronomical information which provides a power and utility heretofore unavailable to the researcher.
U.S. Naval Observatory's Astronomical Applications Dept. is jointly responsible for publishing the annual Astronomical Almanac, Nautical Almanac, and Air Almanac. They also produce MICA, a computer-based almanac, and other astronomical software products. In addition, they compute and make available a wide variety of practical astronomical data.