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ivoa net international virtual observatory alliance international virtual observatory alliance home astronomers deployers members about search international virtual observatory alliance open main menu home astronomers deployers members about search astronomers getting started read more developers introduction to vo concepts read more members working groups read more news ivoa newsletter 27 nov 2026 interop save the date event announcement ivoa june 2026 interoperability meeting new ivoa homepage the virtual observatory vo is an international research data infrastructure in astronomy and astrophysics spelled out this means it defines standards for finding accessing using and describing data ranging from catalogues to images to cubes to complex datasets packaging measurements calibrators simulation data derived data products or whatever else is necessary for research at the limits of the instruments brings together about 50 data centres worldwide adhering to these standards which includes many major players like the cds nasa esa cadc and many others joins the efforts of the authors of client software libraries educational material web portals or science platforms which all cooperate to make data intensive research in astronomy a pleasure or well at least possible in 2025 this translates into some 30 000 resources ranging from a catalogue of a few entries to huge data collections like say the cadc s data holdings which serve hundreds of millions of data sets e g images or spectra and hundreds of billions of catalogue entries most of the resources are immediately accessible for anyone to learn how to do that have a look at what tools have vo support built in or how to do your first steps to build and maintain the vo in the early 2000s several research organisations formed the international virtual observatory alliance ivoa which debates and agrees the technical standards that are needed to make the vo possible if you have suggestions for how to evolve the vo or provide other input your first contact should be the member organisation next to you but your input is also welcome directly with the ivoa s working and interest groups about the ivoa what is the vo what is the ivoa who is involved accomplishments and future plans how do i contact the ivoa how can i participate code of conduct for astronomers getting started using the vo vo glossary vo applications ivoa newsletters vo for students public for developers intro to vo concepts ivoa standards guide to publishing in the vo technical glossary for members ivoa calendar working groups twiki documents in progress mailing lists ivoa roadmap ivoa net contact the ivoa webmaster