Messier 56 — Globular Cluster in Lyra

M56 (NGC 6779) is a globular cluster in the constellation Lyra, located approximately 32,900 light-years from Earth. It shines at magnitude 8.3 and has an apparent diameter of about 8.8 arcminutes, corresponding to a true diameter of roughly 84 light-years. M56 is a moderately concentrated cluster (concentration class X) containing an estimated 230,000 stars. Its age is around 13.7 billion years, making it one of the oldest globular clusters known — nearly as old as the universe itself. The cluster has low metallicity, with heavy-element abundances about 60 times lower than the Sun's. M56 is approaching us at about 145 km/s and lies roughly midway between the bright stars Vega (Alpha Lyrae) and Albireo (Beta Cygni).

M56 is easy to locate roughly halfway between Vega and Albireo along the Lyra-Cygnus border. In binoculars it appears as a small, faint, slightly fuzzy star that might be overlooked if you don't know exactly where to look. A 4-inch telescope at 100x shows a small, round glow with a slightly brighter center but no individual stars resolved. An 8-inch telescope at 150-200x begins to resolve the granular outer edges into individual faint stars, though the core remains unresolved. A 10-inch or larger aperture reveals more stars across the cluster. Best observed from June through October when Lyra is near the zenith in northern skies.

Discovered by Charles Messier on January 19, 1779, while he was tracking a comet. He described it as 'a nebula without stars.' William Herschel was the first to partially resolve it into stars in 1784, describing 'a globular figure of very compressed stars.' The cluster has been used in studies of stellar populations and globular cluster dynamics.