An astronomical catalog is a list or tabulation of astronomical objects, typically grouped together because they share a common type, morphology, origin, means of detection, or method of discovery.
Catalogues, that is tables of the properties of celestial objects (celestial coordinates, brightness etc.), are very important in astronomy and constitute a significant component of the Virtual Observatory.
Astronomicalcatalogues are tables of the positions and measured properties (such as brightness) of a list of celestial objects.
Astronomicalcatalogues, like other astronomical and, indeed, scientific data, are usually rich in metadata, and these metadata are needed to interpret the catalogues correctly.
Astronomicalcatalogues containing from a million up to hundreds of millions of records are becoming commonplace.
Since even larger catalogues will be released in a few years, researchers are faced with the problem of accessing these databases in a general but efficient manner, in order to be able to fully exploit their scientific content.
Large astronomicalcatalogues, with one million up to hundreds of millions of records, are becoming commonplace (e.g., Tycho, GSC I, USNO-1.A).
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