All newsEducate

Science

Lyons Groups of Galaxies

9/3/2026

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. The catalogue was obtained from the Lyon-Meudon Extragalactic Database. Two methods were used in group construction: a percolation method derived from Huchra and Geller and a hierarchical method initiated by

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “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. The catalogue was obtained from the Lyon-Meudon Extragalactic Database. 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.

---

This article is an automated import of the Wikipedia article "Lyons Groups of Galaxies", available at https://en.wikipedia.org/wiki/Lyons_Groups_of_Galaxies . Text is licensed under CC BY-SA 4.0.