Lyons Groups of Galaxies
Lyons Groups of Galaxies (or LGG) is an astronomical catalog of nearby groups of galaxies complete to a limiting apparent magnitude B0=14.0 with a recession velocity smaller than 5,500 km/s. Two methods were used in group construction: a percolation method derived from Huchra and Geller  and a hierarchical method initiated by R. Brent Tully. The catalog is a synthesized version of the two results.
The LGG includes 485 groups and 3,933 member galaxies.
- Huchra, J. P.; Geller, M. J. (June 1982). "Groups of galaxies. I - Nearby groups" (PDF). Astrophysical Journal. Part 1. 257 (June 15, 1982): 423–437. Bibcode:1982ApJ...257..423H. doi:10.1086/160000. Retrieved March 24, 2012.
- Tully, R. B. (April 1980). "Nearby groups of galaxies. I - The NGC 1023 group" (PDF). Astrophysical Journal. Part 1. 237 (Apr. 15, 1980): 390–403. Bibcode:1980ApJ...237..390T. doi:10.1086/157881. Retrieved March 24, 2012.
- LGG description at CDS
- Full LGG list of records at CDS
- ADS: General study of group membership. II - Determination of nearby groups
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