[2] The Principal Galaxies Catalogue (PGC), published in 1989, was based on the Lyon-Meudon Extragalactic Database and contained cross-identifications for it.
[3][2] LEDA was eventually merged with Hypercat to become HyperLEDA in 2000, itself also known as PGC2003.
[4] LEDA originally contained information on more than 60 parameters for about 100,000 galaxies, and now contains information on over 3 million celestial objects, of which about 1.5 million are galaxies.
The database allows astronomers around the world access to its information.
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