M92 - NGC 6341

Messier 92 (NGC 6341) is a globular cluster located approximately 26,700 light-years from Earth in the constellation Hercules. It was discovered by Johann Elert Bode in 1777 and independently found by Charles Messier in 1781. M92 is one of the brightest and most beautiful globular clusters in the northern sky, yet it is perpetually overshadowed by its more famous neighbor M13, the Great Hercules Cluster, which lies only about 9 degrees away. If M92 were located in any other constellation, it would likely be celebrated as one of the premier deep sky objects. The cluster has a visual magnitude of 6.3, making it technically visible to the naked eye under ideal conditions, and it spans about 109 light-years in diameter. M92 is one of the oldest known globular clusters, with age estimates ranging from 12 to 14.2 billion years, potentially making it one of the oldest objects in the Milky Way. The cluster is also very metal-poor, with [Fe/H] of about -2.3, consistent with its extreme age. M92 has a moderately concentrated structure with a Shapley-Sawyer class of IV and contains approximately 330,000 stars. The cluster hosts at least 17 known variable stars, including RR Lyrae types. Due to the precession of Earth's axis, M92 will become the North Pole star cluster in about 14,000 years, when the celestial pole will pass near its position. In amateur telescopes, M92 is a spectacular sight. Binoculars show a bright fuzzy star, while a 4-inch telescope begins to resolve the outer regions into individual stars. An 8-inch telescope provides a stunning view with extensive resolution across much of the cluster's face.

M92 spans about 109 light-years in diameter, contains roughly 330,000 stars, and lies approximately 26,700 light-years from Earth.