- Astronomical Data Center (ADC)
- Astrophysical Data System (ADS)
- Canada Astronomical Data Center (CADC)
- Digitized Sky Survey
- Double Star Library
- JPL's Solar System Dynamics Group
- NASA/IPAC Extragalactic Database (NED)
- National Space Science Data Center (NSSDC)
- NGC/IC Project
- Planetary Data System (PDS)
- SkyView
- Solar Terrestrial Dispatch
- Star Data Pages
- Strasbourg Astronomical Data Center
- U.S. Naval Observatory's Astronomical Applications Dept.
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