Messier 92 is a brilliant globular cluster located in the northern constellation Hercules, just a few degrees northeast of the more famous M13. Though often overshadowed, M92 is a spectacular deep-sky object in its own right—one of the brightest and oldest globular clusters in the Milky Way. It lies about 27,000 light-years away, spans around 100 light-years, and shines at a bright magnitude 6.4, making it visible in binoculars and dazzling in telescopes.
Through the eyepiece, M92 reveals a dense, spherical swarm of ancient stars with a blazing, tightly packed core that gradually fades into a misty halo. In medium to large telescopes, the outer layers begin to resolve into individual points of light, like a fine cosmic snowstorm. The cluster’s high altitude in summer skies and its sharp central condensation make it a favorite for those seeking classic globular beauty with bold contrast and structure.
For stargazers looking to go beyond the popular targets, M92 is a hidden gem—less talked about than M13 but nearly as spectacular. Its brilliance, symmetry, and deep galactic history make it a must-see object during the late spring and summer months, especially when Hercules is riding high overhead.
Messier 92
Rating: 🔵 Stagazer Favorite
Level: 🔵 Easy
How:
When: May - Aug
🌟 It’s Brighter Than You Think Despite living in the shadow of M13, M92 is nearly as bright and visually rewarding. Its strong central condensation and halo of fainter stars make it a spectacular object in any telescope. Once observed, it often surprises viewers with just how luminous and concentrated it is.
🌟 A Perfect Example of a Classic Globular M92 has everything you want in a globular cluster: a bright, dense core; a symmetrical spherical shape; and a halo that resolves beautifully into pinpoint stars in medium and large telescopes. It offers a textbook example of what globular clusters are supposed to look like, especially under dark skies.
🌟 High in the Northern Summer Sky Located in Hercules, M92 rises high overhead for northern observers in the late spring and summer months, making it ideal for long, comfortable viewing sessions. Its altitude reduces atmospheric distortion, helping reveal more detail even in smaller instruments.
🌟 Easily Spotted in Binoculars and Small Telescopes At magnitude 6.4, M92 is visible in binoculars as a compact, fuzzy glow. In a small telescope, the core brightens distinctly and begins to show texture, while larger apertures resolve it into hundreds of glittering stars. It’s accessible to nearly all levels of amateur astronomers.
🌟 Rich in Ancient History M92 is estimated to be over 13 billion years old, making it one of the oldest known globular clusters in the Milky Way. Observing it is like peering into the early universe, at stars that have survived since the galaxy’s formation. For many, that alone is reason enough to include it on their list.
🌟 A Great Pairing with M13 Since M92 lies just ten degrees away from M13, it makes for an ideal side-by-side comparison. Observing both in one session lets you appreciate the subtle differences in size, concentration, and star density. Many observers walk away surprised by how close M92 comes to matching its famous neighbor.
Globular cluster: a dense, spherical collection of tens of thousands to millions of ancient stars bound tightly by gravity, orbiting the outskirts of a galaxy.
Messier 92
Messier 92
✅ Use Medium to High Magnification Start with 80x–120x to frame the whole cluster, then increase to 150x or more to resolve its stars. The core is tight, so higher magnification helps separate individual points in the halo and draw out fine detail.
✅ Observe Under Dark, Moonless Skies While M92 is bright, dark skies dramatically improve contrast and reveal more of the cluster’s outer stars. Avoid moonlight and urban lighting to fully appreciate its richness.
✅ Let Your Eyes Adapt Give yourself 15–20 minutes in darkness before viewing. A fully dark-adapted eye will help you see fainter stars in the cluster’s outer regions and better appreciate its depth.
✅ Try Averted Vision for Fainter Stars Look slightly to the side of M92 rather than directly at it. Averted vision activates more light-sensitive parts of your eye, helping faint stars pop into view, especially near the edges.
✅ Compare with M13 Spend time observing M13 and then hop to M92. The comparison will highlight M92’s more compact, symmetrical structure and make its strengths stand out. Both clusters complement each other well.
✅ Observe Over Time Return to M92 on different nights. As seeing conditions vary, so will your ability to resolve fine structure. Subtle improvements in detail make repeat observations rewarding.
Messier 92
❌ Naked Eye
With the naked eye, Messier 92 is generally invisible under most skies, though it may be faintly detectable from a very dark location as a dim, unresolved point near the keystone of Hercules. Even then, it’s extremely subtle and easy to miss without knowing exactly where to look.
✅ Binoculars
In binoculars, M92 appears as a compact, misty glow—clearly non-stellar, yet unresolved. It stands out well in dark skies, resembling a small, fuzzy star. Its concentrated brightness gives it more presence than many other globulars in binoculars, but individual stars remain hidden.
✅ Small Telescope
Through a small telescope of around 3 to 4 inches, M92 becomes a pleasing, bright ball of light. The dense core shines clearly, and the outer regions begin to show a grainy texture. While most stars remain unresolved, the cluster has a strong, symmetrical appearance that sets it apart from nearby field stars.
✅ Medium Telescope
In a medium telescope of 6 to 8 inches, Messier 92 begins to resolve into individual stars, especially around the edges. The core remains bright and densely packed, while the halo reveals delicate points of light that sparkle with a hint of three-dimensional depth. It’s a rich and rewarding view at moderate magnification.
✅ Large Telescope
With a large telescope, 10 inches or more, M92 becomes a stunning explosion of starlight. The outer halo is finely resolved, with hundreds of stars filling the field. The core remains tight and bright but starts to break apart under high magnification. Its structure is impressively dense, and the view rivals that of Messier 13, offering a beautifully compact and ancient stellar swarm.
Messier 92
Messier 92 remains impressive even in moderately light-polluted skies, but it shows best under dark conditions, where its dense core and expansive halo of stars can fully emerge in all their brilliance.
🟣 In Bortle 1–2 skies, Messier 92 appears crisp, brilliant, and deeply textured. Its dense core glows intensely, and the outer halo is filled with faint, resolved stars, giving it a richly layered, three-dimensional look. The surrounding field is dark and sharp, making the cluster truly stand out.
🔵 In Bortle 3–4 skies, M92 still offers an excellent view. The core remains prominent, and many outer stars are visible, though fine detail begins to soften slightly. The contrast is still strong, and the cluster retains much of its beauty and structure.
🟢 In Bortle 5–6 skies, the core of M92 is still easy to see, but the fainter halo stars begin to fade. The cluster appears more compact, and the background sky glow slightly mutes its brilliance. Resolution drops off toward the edges.
🟠 In Bortle 7+ skies, M92 loses most of its fine structure. It may still be visible as a bright blur with a concentrated center, but few individual stars are discernible. The glow of light pollution overwhelms its outer halo, making it appear softer and less defined.
Messier 92
DSOs within 48° or 2 outstretched hands at arm's length