Globular cluster
M92 (M92)
In Hercules (Her) • Magnitude 6.4 • 14 arcminutes
Open the free AstroPlanner with M92 pre-selected, scored against your telescope, location, and the live cloud forecast.
A spectacular globular cluster in Hercules perpetually overshadowed by its more famous neighbour M13, despite being nearly as impressive. At about 14.2 billion years old, M92 is one of the oldest known globular clusters — potentially as old as the universe itself.
M92 at a glance
| Catalog IDs | M92, N 6341 |
| Type | Globular cluster |
| Constellation | Hercules (Her) |
| Right ascension | 17h 17m 06s |
| Declination | +43° 08' 24" |
| Apparent magnitude | 6.44 |
| Surface brightness | 12.1 mag/arcsec² |
| Angular size | 14.0 × 14.0 arcmin |
| Max altitude at 45°N | 88° |
| Best imaging months | Mar, Apr, May |
How to image M92
M92 sits in the constellation Hercules at right ascension 17h 17m 06s and declination +43° 08' 24". To frame and integrate it well, AstroPlanner will compute the optimal moonless window for tonight from your location, the field-of-view fit against your sensor and focal length, the suggested total integration time given your aperture and sky Bortle class, and a cloud-aware schedule that drops it from the plan if your nearest cloud forecast spike overlaps the best altitude window.