WEBDA
Devoted to stars in galactic open clusters. It offers an interface to a database collecting astronomical observations, and bibliography.

Astronomical Data Center
Data from the National Astronomical Observatory of Japan. Includes catalog service, data archives, imaging services, and journals.

ADC - Astronomical Data Center
NASA's ADC is a resource for astronomical data, catalogs, and journal tables.

CATS Database
Astrophysical CATalogs support System. Contains list of catalogs, table of major radio catalogs, and search tool.

CADC - Canadian Astronomy Data Centre
Contains digitized sky survey, IUE archive, star catalogs, and links.

SAO Telescope Data Center
Creates, and maintains software to process and archive data from optical telescopes at the Oak Ridge Observatory in Harvard, Massachusetts, Whipple Observatory, and Multiple Mirror Telescope on Mt. Hopkins in Arizona. The Smithsonian Astrophysical Observatory (SAO) is part of the Harvard- Smithsonian Center for Astrophysics (CfA) in Cambridge, Massachusetts.

NCSA Astronomy Digital Image Library
(ADIL) collects astronomical, research-quality images and make them available to the astronomical community, and the general public. Offers Library access, image browse, and FITS links.

The UTR-2 Catalogue
Provides a low frequency sky survey of discrete sources obtained in the Institute of Radio Astronomy of the Ukrainian National Academy of Sciences. Images from the UTR-2 radio telescope at a number of the low frequencies used in contemporary radio astronomy within the range from 10 to 25 MHz.

The Aladin Sky Atlas
Provides an interactive sky atlas allowing users to visualize digitized images of any part of the sky. Includes astronomical catalogs, personal user data files, and interactive access to related data from the Simbad database, and Vizier service.

Centre de Données astronomiques de Strasbourg
(CDS) Astronomical databases, bibliography, documentation, and directory.

Multiwavelength Milky Way
The Astrophysics Data Facility (ADF), located at the NASA Goddard Space Flight Center.

CFHT Archive
The Canada-France-Hawaii Telescope Archive. Includes CFHT archives, images, instruments, help, and links.

DSS - The Digitized Sky Survey
Comprises a set of all-sky photographic surveys in E, V, J, R, and N bands conducted with the Palomar, and UK Schmidt telescopes at the Space Telescope Science Institute.

The VLA FIRST Survey
Faint images of the radio sky at the wavelength of 20 centimeters.

ESO/ST-ECF USNO-A1.0 Catalogue Server
Archive provides access to the all-sky catalogue from the set of ten CD-ROMs produced by the US Naval Observatory within the Precise Measurement Machine Project.

Starcast
Provides simultaneously queries, and many astronomical databases. Includes input target coordinates or name, data type, source, and bandpass.

Technical Data for the Arecibo Airglow and Optical Instrumentation
Data information, and instrument documentation from the Arecibo optical facility.

SIMBAD Astronomical Database
Offers data, cross-identifications, observational measurements, and bibliography for celestial objects outside the solar system including stars, galaxies, and nonstellar objects within our galaxy, or in external galaxies.

Personal Web pages
A list of the personal web pages of professional astronomers from around the world. Extensive.

MAST: Multimission Archive at STScI
MAST supports a variety of astronomical data archives, with the primary focus on scientifically related data sets in the optical, ultraviolet, and near-infrared parts of the spectrum.

Infrared Astronomical Satellite (IRAS)
Sky map, and point source catalogs from the all-sky survey.

USGS Planetary GIS Web Server.
Mapping interface that will integrate powerful Geographic Information Systems (GIS) graphical, statistical, and spatial relational tools for analyses of planetary datasets.

Hypercat: Extragalactic database
Search data about millions of galaxies by their name or celestial position. Also an archive of 100,000 images of galaxies.

The Munich Astro Archive
Archives astronomical data. Includes star dates, comets, glossary, astronomical catalogs, calendar, meteor events, and astromaps.

Space Telescope Science Institute
Contains astronomy resources, space data archives, visitor information, and research opportunities.

UK astronomical data-center
Data center that is part of the Cambridge Astronomy Survey Unit providing a selection of data from the UK's ground based telescopes. Includes archives, and catalogs.

The UnOfficial Chandra Data Archive Search
Provides a search tool for the Chandra X-Ray Observatory secondary data products archive.

Byte-O-Matic.NET Astronomical Information Archive
Offers information services, and archiving of various astronomical issues.

2dF QSo Redshift Survey (2QZ)
An Anglo-Australian collaboration surveying 740 square degrees of high-galactic lattiude sky. Contains spectroscopic data release, results, progress report, and input catalogue, survey members, and publications.

Supercosmos Sky Surveys
Provides images, and catalogues of the southern sky in three colours. Includes access to digitised images, and the data derived from SuperCOSMOS scans of photographic Schmidt survey plates.

Solar Data Analysis Centre
Contains solar data, and images. Includes SDAC Data-Finder, current solar images, and TRACE analysis guides.

Islamic Crescents' Observation Project
Global project organized by the Arab Union for Astronomy and Space Sciences (AUASS). Contains data base for Crescent Observations.

NVSS Postage Stamp Server
This postage Stamp server for NRAO/VLA Sky Survey (NVSS) returns radio images of the sky in FITS or JPEG format.

Astronomy: Data Archives
Patrick Shopbell's Astronomy Resources. Contains data archives, astronomical catalogs, atlas of nearby dwarf galaxies, and links.

HEASARC
High Energy Astrophysics Science Archive Research Center. Provides an archive of data on (and software for analyzing) gamma-ray, X-ray, and extreme ultraviolet observations of cosmic (non-solar) sources.

NOAO Data Archives
Operated by the Association of Universities for Research in Astronomy (AURA), Inc. Includes survey programs data archive, and links to other data collections.

Microsoft Research and the SDSS SkyServer
A project to develop an Internet data resource in astronomy. Includes journals, reading, the sky server, team information, and links.

ESO, and Space Telescope Science Archive Facilities
A joint venture of The European Southern Observatory(ESO), and the Space Telescope European Coordinating Facility(ST-ECF). Contains a shared archive server, services, news, updates, digitized sky images, links, and public datasets.

The Royal Astronomical Society
UK organization promoting astronomy, geophysics, and planetary science.

The New UKIRT Archive
The United Kingdom Infrared Telescope Archive. Offers search tool, and operator's log.

AstronomyNook
Contains astronomy data, news, images, information, and downloads.

Radio Astronomy Group, University of Tasmania
Contains student research projects, astronomical data, radio observatories, and history.

Leicester Digitized Sky Survey
An image browser providing access to digitized optical Schmidt plates forming the STScI Survey.

Astronomy Picture of the Day Archive
Daily archive of interesting astronomy photos by NASA.

The Web Nebulae
Features images of Nebulae organized by Bill Arnett. Includes glossary, image list, and sources.

Jim's Hubble Telescope Photo Gallery
Presents photos from the Hubble Space Telescope.

Cambridge Astronomical Survey Unit
Contains information on the PDS and APM microdensitometer facilities, Carlsberg Meridian telescope, data archives, and processing center.

Pat Baker's Astronomy Central
Explores astronomy, the universe, the Hubble telescope, the solar system, and astronomy history. Offers news, images, articles, and links.

Sloan Digital Sky Survey
A survey that maps one-quarter of the entire sky, determining the positions and absolute brightnesses of more than 100 million celestial objects.

NASA Extragalactic Database
(NED).

The ELODIE archive
Hosts more than 16000 Echelle spectra of 2000 objects from the ELODIE spectrograph at OHP observatory.

AAVSO International Database
Over 10 million variable star estimates dating back over 100 years.

Infrared Space Observatory
Data archive by the European Space Agency mission with the participation of ISAS and NASA.

DARTS
A database to provide access for general researchers to observation data about solar, astrophysics and terrestrial information derived by the observation satellites of ISAS. Includes related resource links.

Planetary Data System
PDS archives, and distributes digital data from past, and present NASA planetary missions, astronomical observations, and laboratory measurements. Contains data and services, educational resources, and contact information.