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The Lyon-Meudon Extragalactic Database (LEDA) was a database of galaxies, created in 1983 at the Lyon Observatory. Each galaxy had a number assigned to it, which is now known as its PGC number.[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.
![LEDA 36252 can be found in the HyperLEDA database.[1]](http://upload.wikimedia.org/wikipedia/commons/9/9d/LEDA_36252%2C_a_cosmic_tadpole.jpg)
References
- "LEDA 36252, a cosmic tadpole". Retrieved 29 June 2016.
- "HYPERLEDA Help: Internal number: pgc". HyperLeda. Retrieved 19 January 2017.
- Paturel, G.; Fouque, P.; Bottinelli, L.; Gouguenheim, L. (1989). "VizieR Online Data Catalog: Catalogue of Principal Galaxies (PGC)". VizieR On-line Data Catalog. Bibcode:1995yCat.7119....0P.
- Paturel, G.; et al. (2003). "HYPERLEDA. I. Identification and designation of galaxies". Astronomy and Astrophysics. 412: 45–55. Bibcode:2003A&A...412...45P. doi:10.1051/0004-6361:20031411.
External links
- HYPERLEDA HyperLeda: A database for physics of galaxies
- LEDA data base LEDA Database Reference Page
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